WO2016186059A1 - Station de base et terminal sans fil - Google Patents

Station de base et terminal sans fil Download PDF

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Publication number
WO2016186059A1
WO2016186059A1 PCT/JP2016/064398 JP2016064398W WO2016186059A1 WO 2016186059 A1 WO2016186059 A1 WO 2016186059A1 JP 2016064398 W JP2016064398 W JP 2016064398W WO 2016186059 A1 WO2016186059 A1 WO 2016186059A1
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WIPO (PCT)
Prior art keywords
data
information
enb
resource
priority
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PCT/JP2016/064398
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English (en)
Japanese (ja)
Inventor
剛洋 榮祝
裕之 安達
憲由 福田
真人 藤代
Original Assignee
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to EP16796452.7A priority Critical patent/EP3297364B1/fr
Priority to JP2017519199A priority patent/JP6295377B2/ja
Priority to EP22176449.1A priority patent/EP4075901A1/fr
Publication of WO2016186059A1 publication Critical patent/WO2016186059A1/fr
Priority to US15/812,804 priority patent/US10390256B2/en
Priority to US16/514,416 priority patent/US11337107B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • This application relates to a base station and a wireless terminal used in a communication system.
  • D2D ProSe Device to Device Proximity Service
  • Direct communication is defined as one of D2D ProSe.
  • Mode 1 In direct communication, there are a first mode (Mode 1) in which a base station or a relay node allocates radio resources, and a second mode (Mode 2) in which the user terminal itself selects radio resources from a radio resource pool.
  • Mode 2 In direct communication, there are a first mode (Mode 1) in which a base station or a relay node allocates radio resources, and a second mode (Mode 2) in which the user terminal itself selects radio resources from a radio resource pool.
  • the wireless terminal includes a plurality of pieces of control information according to a receiving unit that receives a plurality of pieces of control information including information on wireless resources used in a proximity service from a base station, and a notification timing of the pieces of control information. And a control unit that determines whether or not the information of the radio resource included in each of the radio resources can be used simultaneously.
  • a wireless terminal is based on a transmission unit that transmits a buffer status report for reporting a buffer amount of transmission data in a proximity service to the base station, and a priority of a logical channel corresponding to the transmission data And a controller that creates the buffer status report.
  • the wireless terminal includes information on a plurality of resource pools used in a proximity service, first priority information on association of each of the plurality of resource pools with a priority, and identification on a logical channel group A receiving unit is provided that receives second priority information related to the association between information and priority from the base station.
  • the base station includes information on a plurality of resource pools used in a proximity service, first priority information on association of each of the plurality of resource pools with a priority, and identification on a logical channel group A transmission unit that transmits second priority information related to the association between information and priority to a wireless terminal is provided.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system.
  • FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
  • FIG. 4 is a diagram for explaining UE / network relay according to the embodiment.
  • FIG. 5 is a block diagram of the UE 100.
  • FIG. 6 is a block diagram of the eNB 200.
  • FIG. 7 is a diagram for explaining the outline of the existing technology.
  • FIG. 8 is a diagram for explaining the operating environment according to the first embodiment.
  • FIG. 9 is a sequence diagram for explaining an operation (part 1) according to the first embodiment.
  • FIG. 10 is a sequence diagram for explaining the operation (part 2) according to the first embodiment.
  • FIG. 11 is a diagram illustrating an example of an extended DCI format for explaining the operation (part 2) according to the first embodiment.
  • FIG. 12 is a sequence diagram for explaining the operation (part 3) according to the first embodiment.
  • FIG. 13 is a diagram illustrating an example of an extended DCI format for explaining the operation (part 3) according to the first embodiment.
  • FIG. 14 is a sequence diagram for explaining the operation (part 4) according to the first embodiment.
  • FIG. 15 is a diagram illustrating an example of SCI assignment for explaining the operation (part 4) according to the first embodiment.
  • FIG. 16 is a diagram for explaining the operation (part 5) according to the first embodiment.
  • FIG. 17 is a diagram illustrating an example of an extended SCI format for explaining the operation (part 1) according to the second embodiment.
  • FIG. 18 is a diagram illustrating an example of an extended DCI format for explaining an operation (part 1) according to the second embodiment.
  • FIG. 19 is a diagram for explaining the operation (part 2) according to the second embodiment.
  • FIG. 20 is a diagram illustrating an example of an extended SCI format for explaining the operation (part 4) according to the second embodiment.
  • FIG. 21 is a diagram for explaining the operation (part 5) according to the second embodiment.
  • FIG. 22 is a diagram for explaining the operation (No. 6) according to the second embodiment.
  • FIG. 23 is a diagram for explaining the operation (part 7) according to the second embodiment.
  • FIG. 24 is a sequence diagram for explaining an operation (part 1) according to the third embodiment.
  • FIG. 25 is a sequence diagram for explaining the operation (part 2) according to the third embodiment.
  • FIG. 26 is a diagram for explaining the operation (part 2) according to the third embodiment.
  • FIG. 27 is a diagram for describing an example of an environment according to the fourth embodiment.
  • FIG. 28 is a diagram illustrating a sequence according to the fourth embodiment.
  • FIG. 29 is a diagram illustrating an example of resource allocation according to the fourth embodiment.
  • FIG. 30 is a diagram illustrating an example of resource allocation according to the fourth embodiment.
  • FIG. 31 is a diagram illustrating an example of resource allocation according to the fourth embodiment.
  • FIG. 32 is a diagram illustrating an example of resource allocation according to the fourth embodiment.
  • FIG. 33 is a diagram for describing an example of an environment according to the sixth embodiment.
  • FIG. 34 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 35 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 36 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 37 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 38 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 39 is a diagram illustrating an example of a sequence according to the sixth embodiment.
  • FIG. 40 is a diagram illustrating an example of a sequence according to an additional example of the sixth embodiment.
  • FIG. 41 is a diagram illustrating an example of a sequence according to an additional example of the sixth embodiment.
  • FIG. 42 is a diagram for explaining a delay from when data is generated until it is transmitted.
  • FIG. 42 is a diagram for explaining a delay from when data is generated until it is transmitted.
  • FIG. 43 is a sequence diagram for explaining an operation according to the seventh embodiment.
  • FIG. 44 is a sequence diagram for explaining an operation according to the first modification of the seventh embodiment.
  • FIG. 45 is a diagram for explaining the operating environment according to the eighth embodiment.
  • FIG. 46 is a sequence diagram for explaining the operation according to the eighth embodiment.
  • FIG. 47 is a diagram for explaining the operation according to the eighth embodiment.
  • FIG. 48 is a diagram for explaining a modified example of the eighth embodiment.
  • FIG. 49 is a sequence diagram for explaining the operation of the ninth embodiment.
  • FIG. 50 is a diagram for explaining the operation of the ninth embodiment.
  • FIG. 51 is a diagram for explaining the operating environment according to the tenth embodiment.
  • FIG. 52 is a sequence diagram for explaining an operation according to the tenth embodiment.
  • FIG. 51 is a diagram for explaining the operating environment according to the tenth embodiment.
  • FIG. 53 is a diagram for explaining the operation according to the tenth embodiment.
  • FIG. 54 is a diagram for explaining an operation according to another embodiment.
  • FIG. 55 is a diagram for explaining an operation according to another embodiment.
  • FIG. 56 is a diagram for explaining the operation according to the other embodiment.
  • FIG. 57 is a diagram for explaining an operation according to another embodiment.
  • FIG. 58 is a diagram for explaining an operation according to another embodiment.
  • FIG. 59 is a diagram for explaining an operation according to another embodiment.
  • FIG. 60 is a diagram for explaining a latency problem of UE-to-network relay.
  • 61 is a diagram for explaining an example of option 1.
  • FIG. FIG. 62 is a diagram for explaining an example of option 2.
  • FIG. 63 is a diagram for explaining an example of option 3.
  • the wireless terminal includes a plurality of pieces of control information according to a receiving unit that receives a plurality of pieces of control information including information on wireless resources used in a proximity service from a base station, and a notification timing of the pieces of control information. And a control unit that determines whether or not the radio resource information included in each of the radio resources can be used simultaneously.
  • a wireless terminal is based on a transmission unit that transmits a buffer status report for reporting a buffer amount of transmission data in a proximity service to the base station, and a priority of a logical channel corresponding to the transmission data And a controller that creates the buffer status report.
  • the wireless terminal includes information on a plurality of resource pools used in a proximity service, first priority information on association of each of the plurality of resource pools with a priority, and identification on a logical channel group You may provide the receiving part which receives the 2nd priority information regarding the correlation of information and a priority from a base station.
  • the base station includes information on a plurality of resource pools used in a proximity service, first priority information on association of each of the plurality of resource pools with a priority, and identification on a logical channel group You may provide the transmission part which transmits the 2nd priority information regarding the correlation of information and a priority to a radio
  • the wireless terminal transmits data to each of multiple destinations by direct communication.
  • the base station for a wireless terminal that transmits data by direct communication in the proximity service, a plurality of SL identifiers that are associated with control information including allocation information of radio resources used in the direct communication
  • a controller for assigning an SL identifier is provided, and the controller secures a radio resource for each of the plurality of SL identifiers, and transmits a plurality of control information corresponding to the plurality of SL identifiers to the radio terminal.
  • the controller assigns the plurality of SL identifiers to the wireless terminal when the wireless terminal is a relay terminal that relays data of the remote terminal between a remote terminal outside the network area and the network. .
  • the controller assigns the plurality of SL identifiers to the wireless terminal when the number of the plurality of destinations exceeds a predetermined value.
  • the controller arranges the plurality of control information in a search space associated with a specific SL identifier among the plurality of SL identifiers.
  • a wireless terminal corresponds to a receiver that receives a plurality of SL identifiers associated with a plurality of control information including allocation information of radio resources used in direct communication in a proximity service, and the plurality of SL identifiers
  • a controller that transmits data to each of a plurality of destinations by the direct communication based on allocation information of a plurality of radio resources included in each of the plurality of control information.
  • the base station includes a controller that transmits control information including allocation information of a first radio resource used for direct communication in a proximity service, and the controller includes a second radio resource used for the direct communication.
  • the control information including the allocation information and the index is transmitted, and the index indicates whether not only the first radio resource but also the second radio resource can be used.
  • the radio terminal includes a receiver that receives control information including allocation information of a first radio resource used for direct communication in a proximity service, and the receiver is a second radio resource used for the direct communication.
  • the control information including the allocation information and the index is received, and the index indicates whether not only the first radio resource but also the second radio resource can be used.
  • a base station includes a controller that secures a plurality of radio resources in one radio resource pool for a radio terminal that transmits data to each of a plurality of destinations by direct communication in a proximity service, Then, one control information including a plurality of allocation information composed of allocation information of each of the plurality of radio resources is transmitted to the radio terminal.
  • the controller includes different indexes corresponding to the allocation information of each of the plurality of radio resources in the one control information.
  • the radio terminal is based on a receiver that receives one control information including a plurality of allocation information including allocation information of each of a plurality of radio resources used in direct communication in a proximity service, and the plurality of allocation information. And a controller that transmits data to each of a plurality of destinations by the direct communication.
  • the wireless terminal includes a controller that sets a wireless resource pool in which a wireless resource for transmitting data by direct communication in a proximity service is selected, and the controller, when permitted by a base station, A plurality of radio resources for transmitting a plurality of control information including data allocation information transmitted by direct communication are selected from the radio resource pool.
  • the radio terminal selects a plurality of radio resources for transmitting data to each of a plurality of destinations by direct communication in the proximity service, the plurality of radio resources do not overlap each other in the time direction.
  • the controller to select is provided.
  • the radio terminal includes a controller that selects a plurality of radio resources for transmitting data to each of a plurality of destinations by direct communication in a proximity service, and extended control information including allocation information for each of the plurality of radio resources Transmitting to the plurality of destinations.
  • the controller has a higher transmission rate than MCS (Modulation and Coding Scheme) applied to control information including allocation information of radio resources selected to transmit data to one destination by the direct communication.
  • MCS Modulation and Coding Scheme
  • MCS is applied to the extended control information.
  • the transceiver transmits the extended control information using a radio resource amount larger than control information including allocation information of radio resources selected to transmit data to one destination by the direct communication. To do.
  • the controller selects a radio resource for transmitting the extended control information from a preset radio resource pool.
  • the transceiver when the wireless terminal is a relay terminal that relays data by direct communication between a remote terminal outside the network area and the network, the transceiver directs the information of the wireless resource pool to the plurality of destinations. And the controller selects a radio resource for transmitting the extended control information from the radio resource pool.
  • the wireless terminal includes a controller that generates a packet including a plurality of data composed of data of a plurality of destinations, and a special destination identifier indicating that the plurality of data of the plurality of destinations are included in the packet And a transceiver that transmits control information including radio resource allocation information for the wireless terminals corresponding to the multiple destinations to receive the packets to the multiple destinations.
  • the special destination identifier is a broadcast identifier.
  • the special destination identifier includes at least a part of an identifier used when the wireless terminal is a relay terminal that relays data of the remote terminal between a remote terminal outside the network area and the network. .
  • the wireless terminal includes a controller that generates a packet including a plurality of data including data of a plurality of destinations, a destination identifier indicating that the plurality of data of the plurality of destinations are included in the packet,
  • the wireless terminal includes a controller that generates a packet including a plurality of data including data of a plurality of destinations, a plurality of destination identifiers including destination identifiers indicating the plurality of destinations, and the plurality of destinations. And a transceiver that transmits control information including radio resource allocation information for receiving the packet to the plurality of destinations.
  • the wireless terminal includes a destination identifier indicating that a packet transmitted by direct communication in a proximity service includes a plurality of data including data of each of a plurality of destinations, and a plurality of radios corresponding to the plurality of destinations
  • the packet is received based on the information.
  • the controller omits reception of the packet retransmitted from the other wireless terminal when the data of the wireless terminal is not included in the packet.
  • the allocation information indicates an arrangement of a plurality of packets that are composed of the packets and are arranged differently in a time direction, and the controller transmits data of the wireless terminal to a first packet of the plurality of packets. Is not included, reception of the remaining packets of the plurality of packets is omitted.
  • the allocation information indicates an arrangement of a plurality of packets that are composed of the packets and are arranged differently in a time direction
  • the controller has a plurality of destinations included in the packet within the predetermined period.
  • the controller receives timing information indicating a timing that can be changed, and the controller receives a packet transmitted at a timing at which the plurality of destinations can be changed among the plurality of packets based on the timing information.
  • the controller when the destination of the wireless terminal is not included in a packet transmitted at a timing when the destination is changed among the plurality of packets, the controller performs the packet until the next timing when the destination is changed. Is omitted.
  • the controller transmits the destination of the wireless terminal before the end of the predetermined period when the packet transmitted at the last timing indicated by the timing information among the plurality of packets does not include the destination of the wireless terminal.
  • the allocation information is discarded.
  • the wireless terminal When transmitting data of each of a plurality of destinations by direct communication in a proximity service, the wireless terminal according to the embodiment corresponds to the controller that sets identification information of a different logical channel for each of the plurality of destinations, and the identification information A transceiver that carries data of each of the plurality of destinations on a logical channel.
  • the transceiver notifies the usage status of the identification information to another radio terminal, and the controller sends the identification information of the logical channel selected based on the usage status of the identification information to the other radio terminal.
  • the transceiver carries data addressed to the other wireless terminal on a logical channel corresponding to identification information of the selected logical channel.
  • the base station for a wireless terminal that transmits data by direct communication in a proximity service, an SL identifier associated with control information including assignment information of a wireless resource used in the direct communication, and a wireless resource
  • a controller for allocating a plurality of different sets including a set with a pool is transmitted, and the controller transmits a plurality of control information including the control information corresponding to each of the plurality of sets to the wireless terminal.
  • the controller arranges the plurality of control information in a search space associated with a specific SL identifier included in any of the plurality of control information.
  • the base station includes a controller that allocates an SL identifier associated with control information including allocation information of radio resources used in the direct communication to a radio terminal that transmits data by direct communication in a proximity service.
  • the controller notifies the radio terminal of a plurality of radio resource pools associated with the SL identifier and an index of each of the plurality of radio resource pools, and the controller transmits a radio signal indicated by the allocation information.
  • a plurality of control information including the control information including information indicating an index of a radio resource pool in which resources are included is transmitted to the radio terminal.
  • the information indicating the index is a time position where the allocation information is arranged.
  • the base station includes a controller that sets a plurality of radio resource pools for selecting a radio resource for transmitting the data to a radio terminal that transmits data by direct communication in a proximity service; And a transceiver that transmits information about whether or not the wireless resource pools of the wireless resource pools can be simultaneously used to the wireless terminal.
  • the information is a list indicating a combination of radio resource pools that can be used simultaneously among the plurality of radio resource pools.
  • the information is a list indicating only radio resource pools that can be used simultaneously among the plurality of radio resource pools.
  • the wireless terminal includes a controller that receives a plurality of control information transmitted using a plurality of wireless resources continuous in the frequency direction by direct communication in a proximity service, and the controller includes a plurality of wireless resources arranged Based on the number of patterns to be processed, processing for receiving the plurality of control information is performed.
  • the wireless terminal includes a controller that receives a plurality of control information transmitted using a plurality of wireless resources continuous in the frequency direction by direct communication in a proximity service, and the controller includes the plurality of wireless resources Based on the information associated with the resource pool to be arranged, processing for receiving the plurality of control information is performed.
  • the radio terminal includes a controller that transmits a plurality of control information that is transmitted using a plurality of radio resources continuous in the frequency direction by direct communication in a proximity service, and the controller transmits an OFDM signal or a plurality of clusters. To transmit the plurality of control information.
  • 3GPP 3rd Generation Partnership Project
  • ProSe Proximity-based Services
  • the first wireless terminal (ProSe UE-to-Network Relay) transmits data (traffic) of the second wireless terminal between the second wireless terminal (Remote UE) outside the network area and the network. ) Is included (see, for example, 3GPP Technical Report “TS 23.303 V12.4.0” March 19, 2015).
  • the base station directly transmits the data between the first wireless terminal and the own base station to the second wireless terminal capable of relaying data by direct communication with the first wireless terminal.
  • a control unit that notifies a setting for using a radio resource used for communication is provided, and the control unit directly designates its own base station to the second radio terminal according to predetermined information
  • a setting for using a radio resource or a setting for using a radio resource selected by the first radio terminal is notified.
  • the predetermined information includes a resource capacity for transmitting downlink control information, a processing load of the own base station, a transmission delay of the downlink control information, and a power of the second radio terminal. At least one of the situations.
  • the radio resource is the first radio terminal.
  • a pattern in the time direction of the radio resource is set so as not to overlap with the radio resource used for the direct communication preset in the terminal.
  • the radio resource when the control unit notifies the second radio terminal of a setting for using the radio resource directly designated by the own base station, the radio resource is the first radio terminal.
  • a pattern in the time direction of the radio resource is set so as not to overlap with the radio resource used for the direct communication directly designated by the own base station for the terminal.
  • the radio resource is the first radio terminal.
  • Information about the radio resource is notified at a predetermined timing so as not to overlap the radio resource used for the direct communication directly designated by the own base station to the terminal.
  • control unit when the control unit notifies the second radio terminal of the setting for using the radio resource directly designated by the own base station, the control unit determines the number of times to repeat the assignment of the radio resource. Set.
  • the wireless resource when the control unit notifies the second wireless terminal of a setting for using the wireless resource selected by the first wireless terminal, the wireless resource is the first wireless terminal.
  • the position of the radio resource in the time direction is set so as not to overlap with the radio resource used for the direct communication preset in the terminal.
  • the base station includes a control unit that allocates a plurality of radio resources that can be selected by a user terminal, and the control unit prioritizes each radio resource in the plurality of allocated radio resources based on predetermined information.
  • the plurality of radio resources are radio resources related to inter-terminal communication.
  • the base station includes a control unit that determines a second wireless terminal capable of relaying data transmission between the first wireless terminal and the own base station by direct communication with the first wireless terminal.
  • the control unit determines a wireless terminal that satisfies a predetermined condition as the second wireless terminal.
  • the control unit includes a wireless terminal in which a wireless environment with the first wireless terminal is a predetermined threshold or more, a wireless terminal in which a wireless environment with the base station is a predetermined threshold or more, Alternatively, a wireless terminal capable of relaying data transmission between the first wireless terminal and the base station by direct communication with the first wireless terminal is determined as a wireless terminal satisfying the predetermined condition. .
  • control unit notifies the setting information of the second wireless terminal to the wireless terminal that satisfies the predetermined condition.
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that transmits control information for notifying a wireless resource allocated for transmitting data by the direct communication to another wireless terminal by the direct communication.
  • control information for notifying a wireless resource allocated for transmitting data by the direct communication to another wireless terminal by the direct communication.
  • the controller When the high priority data having a higher priority than the data scheduled to be transmitted using the predetermined radio resource notified by the control information is generated after notifying the control information, the controller The high priority data is transmitted before the data scheduled to be transmitted using a resource.
  • the controller transmits information indicating that the data transmitted using the predetermined radio resource is not the data scheduled to be transmitted but the high priority data.
  • the controller transmits the high priority data using logical channel identification information having a higher priority than logical channel identification information for the data to be transmitted.
  • the controller includes, in the control information, a destination identifier of a candidate terminal that can be a transmission destination of the high priority data, in addition to a destination identifier of the data to be transmitted.
  • the controller includes a resource pool used for the wireless terminal to transmit the high priority data by the direct communication and a destination identifier of a candidate terminal that can be a transmission destination of the high priority data. Notify the terminal.
  • the predetermined radio resource exists in the resource pool.
  • the controller notifies the candidate terminal of the resource pool and the destination identifier of the candidate terminal via a base station or through a direct discovery procedure in the proximity service.
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that receives control information for notifying a radio resource allocated to transmit data by the direct communication from another wireless terminal by the direct communication. After the controller receives the control information, the controller uses high-priority data having a higher priority than data scheduled to be transmitted using the predetermined radio resource notified by the control information, using the predetermined radio resource. The high priority data is received before the data scheduled to be transmitted.
  • the controller receives information indicating that the data received using the predetermined radio resource is not the data scheduled to be transmitted but the high priority data.
  • the controller receives the high priority data using logical channel identification information having a higher priority than logical channel identification information for the data to be transmitted. The controller determines that the high priority data has been received based on identification information of the logical channel having a high priority.
  • control information includes a reception identifier of a candidate terminal that can be a transmission destination of the high priority data, in addition to a destination identifier of the data scheduled to be transmitted.
  • the destination identifier of the candidate terminal indicates the wireless terminal, data transmitted using the predetermined wireless resource is received.
  • the controller includes a resource pool used for the other wireless terminal to transmit the high priority data by the direct communication, a destination identifier of a candidate terminal that can be a transmission destination of the high priority data, Receive.
  • the predetermined radio resource exists in the resource pool. The controller receives data transmitted from the other wireless terminal using the predetermined wireless resource even when the destination identifier of the wireless terminal is not included in the control information.
  • the controller receives the resource pool and the destination identifier of the candidate terminal via a base station or by a direct discovery procedure in the neighborhood service.
  • the wireless terminal includes a controller that transmits different data to each of a plurality of destinations by direct communication in the proximity service.
  • the controller restricts transmission of data that is transmitted after the data that is transmitted first.
  • the controller transmits the data transmitted later without limitation.
  • D2D ProSe Device to Device Proximity Service
  • Direct communication is defined as one of D2D ProSe.
  • the wireless terminal can transmit data by direct communication using the wireless resource in the transmission resource pool.
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that transmits first data to the other wireless terminal by the direct communication using a wireless resource in a first resource pool that is repeatedly arranged in the time direction at a predetermined cycle.
  • the controller uses the radio resource in the second resource pool that is repeatedly arranged in a cycle shorter than the predetermined cycle. Is transmitted to the other wireless terminal by the direct communication.
  • the controller receives priority information related to the association between the resource pool used for the direct communication and the priority from the base station.
  • the controller selects the second resource pool having a higher priority than the priority of the first resource pool as a resource pool for transmitting the second data based on the priority information.
  • the controller receives, from a base station, information on an essential resource pool that must be monitored among resource pools used for the direct communication.
  • the controller selects the second resource pool, which is the essential resource pool, as a resource pool for transmitting the second data, based on information on the essential resource pool.
  • the controller when the retransmission of the packet corresponding to the first data is not completed before transmitting the second data, the controller gives priority to the transmission of the second data over the retransmission of the packet.
  • the controller transmits the second data after the retransmission of the packet is completed. Start.
  • the controller transmits the second data based on an instruction from the base station when retransmission of a packet corresponding to the first data is not completed before transmitting the second data. It is determined whether or not the retransmission of the packet is completed before performing.
  • the controller receives, from the base station, monitor information related to a resource pool monitored by the other wireless terminal in the second resource pool. An interval in the time direction of the resource pool monitored by the other wireless terminal is shorter than the predetermined period. The controller transmits the second data to the other wireless terminal based on the monitor information.
  • the second resource pool is provided in a carrier different from the carrier in which the first resource pool is provided.
  • the controller receives priority information related to the association between the carrier and the priority from the base station.
  • the controller is a resource for transmitting the second data to the second resource pool provided in a carrier having a higher priority than the priority of the carrier in which the first resource pool is provided based on the priority information. Select as a pool.
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that receives first data from another wireless terminal through the direct communication using a wireless resource in a first resource pool that is repeatedly arranged in the time direction at a predetermined cycle.
  • the controller uses a radio resource in a second resource pool that is repeatedly arranged at a cycle shorter than the predetermined cycle to transmit second data having a higher priority than the first data by the direct communication. Receive from a wireless terminal.
  • the controller indicates the number of carriers that the wireless terminal can simultaneously receive when the second resource pool is provided in a carrier different from the carrier in which the first resource pool is provided.
  • the second data is received based on the number of reception chains.
  • the base station includes a controller that includes a first resource pool that is repeatedly arranged in a time direction at a predetermined cycle and a second resource pool that is repeatedly arranged at a cycle shorter than the predetermined cycle.
  • the first resource pool is used for a first wireless terminal that performs direct communication in the proximity service to transmit first data to the second wireless terminal through the direct communication.
  • the second resource pool is for the first wireless terminal to transmit the second data to the second wireless terminal through the direct communication when second data having a higher priority than the first data occurs. Used for.
  • the controller transmits priority information related to the association between the resource pool used for the direct communication and the priority to the first wireless terminal.
  • the controller transmits, to the first wireless terminal and the second wireless terminal, information related to an essential resource pool that must be monitored among resource pools used for the direct communication.
  • the controller before the first wireless terminal transmits the second data, when the retransmission of the packet corresponding to the first data is not completed, transmits the second data before transmitting the second data.
  • An instruction for determining whether or not to complete retransmission of the packet is transmitted to the first wireless terminal.
  • the controller transmits, to the first wireless terminal, monitoring information related to a resource pool monitored by the second wireless terminal in the second resource pool.
  • the second resource pool is provided in a carrier different from the carrier in which the first resource pool is provided.
  • the controller transmits priority information related to association between a carrier and a priority to the first wireless terminal.
  • the controller is based on at least one of the number of transmission chains indicating the number of carriers that the first wireless terminal can simultaneously transmit and the number of reception chains indicating the number of carriers that the second wireless terminal can simultaneously receive. An association between the carrier and the priority is determined.
  • the base station is a base station that can be connected to a wireless terminal that transmits control information by direct communication in a proximity service using control resources in a control resource pool that are arranged at intervals in the time direction. is there.
  • the base station is arranged after the second data is generated.
  • a controller is provided that allocates a predetermined radio resource located before the pool to the radio terminal as a radio resource for the second data transmitted by the direct communication.
  • the controller allocates the predetermined radio resource located outside the data resource pool in which the data resource is arranged to the radio terminal.
  • the controller allocates the predetermined radio resource to the radio terminal when receiving information indicating the occurrence of the second data from the radio terminal.
  • the controller receives an SL buffer status report in the proximity service including the data amount of the second data as information indicating the occurrence of the second data.
  • the controller notifies the wireless terminal of information related to the priority of identification information related to a logical channel.
  • the controller determines whether the SL buffer status report received from the wireless terminal is information indicating the occurrence of the second data based on identification information regarding the logical channel included in the SL buffer status report. to decide.
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that transmits control information through the direct communication using a control resource in a control resource pool arranged at intervals in the time direction.
  • the controller has a control resource pool arranged after the second data is generated.
  • a predetermined radio resource located before the time is allocated from the base station as a radio resource for the second data transmitted to another radio terminal by the direct communication.
  • the controller when the second data is generated, transmits information indicating the generation of the second data to the base station.
  • the controller includes the data amount of the second data in the SL buffer status report in the proximity service, and transmits the SL buffer status report to the base station as information indicating the occurrence of the second data.
  • the controller prioritizes the SL buffer status report including the data amount of the second data over a buffer status report for cellular communication and an SL buffer status report including the data amount of the first data. To the base station.
  • the controller receives information on the priority of identification information on logical channels from the base station.
  • the controller includes, in the SL buffer status report, identification information regarding a logical channel having a priority corresponding to the priority of the second data based on the information regarding the priority.
  • the controller when the retransmission of the packet corresponding to the first data is not completed before transmitting the second data using the predetermined radio resource, the controller performs the retransmission of the packet rather than the retransmission of the packet.
  • the second data is preferentially transmitted.
  • the controller completes retransmission of the packet if retransmission of the packet corresponding to the first data is not completed before transmitting the second data using the predetermined radio resource. Later, transmission of the second data is started.
  • the controller responds to an instruction from the base station when retransmission of a packet corresponding to the first data is not completed before transmitting the second data using the predetermined radio resource. Based on this, it is determined whether or not retransmission of the packet is completed before transmitting the second data.
  • the controller transmits reception request information serving as a trigger for an operation for receiving the second data to the other wireless terminal.
  • the controller requests the reception request information based on at least one of a physical side link broadcast channel carrying information related to a system and synchronization, a synchronization signal in the neighboring service, and a discovery signal in the neighboring service. Is transmitted to the other wireless terminal.
  • the second radio resource includes not only a predetermined radio resource for transmitting the second data but also a radio resource for transmitting control information for notifying the predetermined radio resource. .
  • the wireless terminal performs direct communication in the proximity service.
  • the wireless terminal includes a controller that receives control information from another wireless terminal through the direct communication using a control resource in a control resource pool arranged at intervals in the time direction.
  • the controller has a control resource pool arranged after the second data is generated.
  • the second data is received using a predetermined radio resource located before the time.
  • the controller receives, from the other wireless terminal, reception request information that triggers an operation for receiving the second data.
  • the controller receives the second data based on the reception request information.
  • the controller receives control information for notifying the predetermined radio resource used for transmission of the second data from the other radio terminal based on the reception request information.
  • the controller receives the reception request information including the control information.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system.
  • the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
  • a server 400 is provided in an external network that is not managed by an operator of the cellular network.
  • the UE 100 corresponds to a wireless terminal.
  • the UE 100 is a mobile communication device.
  • the UE 100 performs radio communication with a cell (serving cell).
  • the configuration of the UE 100 will be described later.
  • the E-UTRAN 10 corresponds to a radio access network.
  • the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
  • the eNB 200 corresponds to a base station.
  • the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
  • ENB 200 manages one or a plurality of cells.
  • the eNB 200 performs radio communication with the UE 100 that has established a connection with the own cell.
  • the eNB 200 has a radio resource management (RRM) function, a routing function of user data (hereinafter simply referred to as “data”), a measurement control function for mobility control / scheduling, and the like.
  • RRM radio resource management
  • Cell is used as a term indicating a minimum unit of a wireless communication area.
  • Cell is also used as a term indicating a function of performing wireless communication with the UE 100.
  • the EPC 20 corresponds to a core network.
  • the EPC 20 includes a MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and a P-GW (Packet Data Network Gateway) 350.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • P-GW Packet Data Network Gateway
  • MME performs various mobility control etc. with respect to UE100.
  • the S-GW performs data transfer control.
  • the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
  • the E-UTRAN 10 and the EPC 20 constitute a network.
  • the P-GW 350 performs control for relaying user data from the external network (and to the external network).
  • Server 400 is a ProSe application server (ProSe Application Server).
  • the Server 400 manages an identifier used in ProSe.
  • the server 400 stores “EPC ProSe user ID” and “ProSe function ID”. Further, the server 400 maps “application layer user ID” and “EPC ProSe user ID”.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 2, the radio interface protocol is divided into the first to third layers of the OSI reference model.
  • the first layer is a physical (PHY) layer.
  • the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
  • the third layer includes an RRC (Radio Resource Control) layer.
  • the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping.
  • Data and control signals are transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ: Hybrid Automatic Repeat Request), random access procedure, and the like.
  • Data and control signals are transmitted between the MAC layer of the UE 100 and the MAC layer of the eNB 200 via a transport channel.
  • the MAC layer of the eNB 200 includes a scheduler. The scheduler determines an uplink / downlink transport format (transport block size, modulation and coding scheme (MCS)) and an allocation resource block to the UE 100.
  • MCS modulation and coding scheme
  • the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data and control signals are transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
  • the PDCP layer performs header compression / decompression and encryption / decryption.
  • the RRC layer is defined only in the control plane that handles control signals. Messages for various settings (RRC messages) are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
  • the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
  • RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in the RRC connected state (connected state), and otherwise, the UE 100 is in the RRC idle state (idle state).
  • the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
  • FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Division Multiple Access
  • the radio frame is composed of 10 subframes arranged in the time direction.
  • Each subframe is composed of two slots arranged in the time direction.
  • the length of each subframe is 1 ms.
  • the length of each slot is 0.5 ms.
  • Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
  • Each resource block includes a plurality of subcarriers in the frequency direction.
  • One symbol and one subcarrier constitute one resource element (RE).
  • a frequency resource can be specified by a resource block, and a time resource can be specified by a subframe (or slot).
  • the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting a downlink control signal. Details of the PDCCH will be described later.
  • the remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting downlink data.
  • PDSCH physical downlink shared channel
  • both ends in the frequency direction in each subframe are regions used mainly as physical uplink control channels (PUCCH) for transmitting uplink control signals.
  • the remaining part of each subframe is an area that can be used as a physical uplink shared channel (PUSCH) mainly for transmitting uplink data.
  • PUSCH physical uplink shared channel
  • ProSe Proximity-based Services
  • a direct radio link that does not go through the eNB 200.
  • a direct radio link in ProSe is referred to as a “side link”.
  • “Sidelink” is a UE-UE interface for direct discovery and direct communication. “Sidelink” corresponds to the PC5 interface.
  • the PC 5 is a reference point between UEs that can use the proximity service used for direct discovery, direct communication and UE / network relay by proximity service, and for the user plane.
  • the PC5 interface is a UE-UE interface in ProSe.
  • Direct discovery is a mode in which a partner is searched by directly transmitting a discovery signal that does not designate a specific destination between UEs.
  • Direct discovery is a procedure for discovering another UE in the vicinity of the UE using a direct radio signal in E-UTRA (Evolved Universal Terrestrial Radio Access) via the PC 5.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the direct discovery is a procedure adopted by the UE 100 capable of executing the proximity service in order to discover other UEs 100 capable of executing the proximity service using only the capability of the two UEs 100 with the E-UTRA technology.
  • Direct discovery is supported only when UE 100 is served by E-UTRAN (eNB 200 (cell)). When the UE 100 is connected to the cell (eNB 200) or located in the cell, the UE 100 can be served by the E-UTRAN 10.
  • the “Sidelink Direct Discovery” protocol stack includes a physical (PHY) layer, a MAC layer, and a ProSe protocol.
  • a discovery signal is transmitted between a physical layer of UE (A) and a physical layer of UE (B) via a physical channel called a physical side link discovery channel (PSDCH).
  • a discovery signal is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link discovery channel (SL-DCH).
  • Direct communication is a mode in which data is directly transmitted between UEs by specifying a specific destination (destination group).
  • the direct communication is communication between two or more UEs that can execute a proximity service by user plane transmission using E-UTRA technology via a route that does not pass through any network node.
  • the direct communication resource allocation type includes “mode 1” in which the eNB 200 designates radio resources for direct communication and “mode 2” in which the UE 100 selects radio resources for direct communication.
  • the direct communication protocol stack includes a physical (PHY) layer, a MAC layer, an RLC layer, and a PDCP layer.
  • a control signal is transmitted via the physical side link control channel (PSCCH), and data is transmitted via the physical side link shared channel (PSSCH). Is transmitted.
  • a synchronization signal or the like may be transmitted via a physical side link broadcast channel (PSBCH).
  • PSBCH physical side link broadcast channel
  • Data is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link shared channel (SL-SCH).
  • SL-SCH side link shared channel
  • STCH side link traffic channel
  • FIG. 4 is a diagram for explaining UE / network relay according to the embodiment.
  • a remote UE is a UE 100 that is not directly provided with a service by the E-UTRAN 10 (a UE 100 that is not served by the E-UTRAN 10).
  • the remote UE may be located outside the network (Out-of-Network) (out of cell coverage).
  • the remote UE may be located within the coverage of the cell.
  • the remote UE 100 can communicate with a packet data network (PDN: Packet Data Network) via a relay UE described later.
  • PDN Packet Data Network
  • the remote UE may be a public safety (UE) for public safety (ProSe-enabled Public Safe UE).
  • ProSe-enabled Public Safety UE is configured so that HPLMN (Home Public Land Mobile Network) permits use for public safety.
  • HPLMN Home Public Land Mobile Network
  • ProSe-enabled Public Safety UE can use the neighborhood service and supports the procedure in the neighborhood service and specific capabilities for public safety.
  • ProSe-enabled Public Safe UE transmits information for public safety through a neighborhood service.
  • the information for public safety is, for example, information on disasters (earthquakes, fires, etc.), information used for fire fighting personnel or police personnel, and the like.
  • the remote UE is provided with a ProSe relay service from the relay UE, as will be described later.
  • the UE / network relay is executed between the remote UE provided with the ProSe relay service and the relay UE provided with the ProSe relay service.
  • Relay UE Provides ProSe relay service for remote UEs.
  • the relay UE provides service continuity of communication with the packet data network for the remote UE. Therefore, the relay UE relays data (unicast traffic) between the remote UE and the network.
  • the relay UE relays data (traffic) of the remote UE by a proximity service (direct communication).
  • the relay UE relays data (uplink traffic) received from the remote UE via the PC5 interface to the eNB 200 via the Uu interface (LTE-Uu) or the Un interface (LTE-Un).
  • the relay UE relays data (downlink traffic) received from the eNB 200 via the Uu interface or Un interface to the remote UE via the PC5 interface.
  • the relay UE is located only in the network (within the coverage of the cell).
  • the relay UE can provide a comprehensive function that can relay any type of traffic related to communication for public safety.
  • Relay UE and remote UE can transmit data and control signals between physical layers.
  • the relay UE and the remote UE can transmit data and control signals between the MAC layer, the RLC layer, and the PDCP layer.
  • the relay UE may have an IP relay (IP-Relay) layer as an upper layer of the PDCP layer.
  • the remote UE may have an IP layer as an upper layer of the PDCP layer.
  • the relay UE and the remote UE can transmit data and control signals between the IP relay layer and the IP layer. Further, the relay UE can transmit data between the IP relay layer and the IP layer of the PGW 350.
  • the relay UE can transmit data (traffic) to the remote UE using broadcast in the AS layer (Access Stratum).
  • the relay UE may transmit data to the remote UE using unicast in the AS layer.
  • the UE / network relay is performed using broadcast, feedback in the AS layer is not performed between the relay UE and the remote UE, but feedback in the NAS layer (Non Access Stratum) is performed. Also good.
  • UE / network relay is performed using unicast, feedback in the AS layer may be performed.
  • FIG. 5 is a block diagram of the UE 100. As illustrated in FIG. 5, the UE 100 includes a receiver (receiver) 110, a transmitter (transmitter) 120, and a controller (controller) 130. The receiver 110 and the transmitter 120 may be an integrated transceiver (transmission / reception unit).
  • the receiver 110 performs various types of reception under the control of the controller 130.
  • the receiver 110 includes an antenna.
  • the receiver 110 converts a radio signal received by the antenna into a baseband signal (received signal) and outputs it to the controller 130.
  • the receiver 110 can simultaneously receive radio signals at two different frequencies.
  • the UE 100 includes two receivers 110 (2 RX Chain).
  • the UE 100 can receive a radio signal for cellular by one receiver 110 and can receive a radio signal for ProSe by the other receiver 110.
  • the transmitter 120 performs various transmissions under the control of the controller 130.
  • the transmitter 120 includes an antenna.
  • the transmitter 120 converts the baseband signal (transmission signal) output from the controller 130 into a radio signal and transmits it from the antenna.
  • the controller 130 performs various controls in the UE 100.
  • the controller 130 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor may include a codec that performs encoding / decoding of an audio / video signal.
  • the processor executes various processes described later and various communication protocols described above.
  • the UE 100 may include a GNSS receiver.
  • the GNSS receiver receives a GNSS signal and outputs the received signal to the controller 130 in order to obtain position information indicating the geographical position of the UE 100.
  • UE100 may have a GPS function for acquiring position information on UE100.
  • FIG. 6 is a block diagram of the eNB 200.
  • the eNB 200 includes a receiver (reception unit) 210, a transmitter (transmission unit) 220, a controller (control unit) 230, and a network interface (backhaul communication unit) 240.
  • the receiver 210 and the transmitter 220 may be an integrated transceiver (transmission / reception unit).
  • the receiver 210 performs various types of reception under the control of the controller 230.
  • the receiver 210 includes an antenna.
  • the receiver 210 converts a radio signal received by the antenna into a baseband signal (received signal) and outputs it to the controller 230.
  • the transmitter 220 performs various transmissions under the control of the controller 230.
  • the transmitter 220 includes an antenna.
  • the transmitter 220 converts the baseband signal (transmission signal) output from the controller 230 into a radio signal and transmits it from the antenna.
  • the controller 230 performs various controls in the eNB 200.
  • the controller 230 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor executes various processes described later and various communication protocols described above.
  • the network interface (backhaul communication unit) 240 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
  • the network interface 240 is used for communication performed on the X2 interface and communication performed on the S1 interface.
  • FIG. 7 is a diagram for explaining the outline of the existing technology.
  • UE 100-1 transmits data to each of a plurality of UEs 100 by direct communication.
  • a radio resource pool used for direct communication includes a control area (SC pool: SC pool) in which side link control information (SCI: Sidelink Control Information) is arranged, and a data area (data pool: Data) in which data is arranged. pool).
  • SC pool SC pool
  • data pool Data
  • the data area is an area that follows the control area in the time direction.
  • the data area may overlap with the control area in the time direction.
  • a plurality of radio resource pools are arranged in the time direction.
  • the length of one radio resource pool in the time direction coincides with an SC period (SC Period) that is a cycle of the radio resource pool.
  • SC Period SC Period
  • UE 100-1 transmits data to each of a plurality of groups (group 1-5) having different destinations.
  • group 1-5) only one SCI can be transmitted in one SC period. Therefore, description will be made assuming that the UE 100-1 transmits data to a plurality of groups in order.
  • the UE 100-1 transmits the SCI to the group 1 in the first SC period, and transmits data to the group 1 using the radio resource indicated by the SCI.
  • the UE 100-1 transmits the SCI to the group 2 in the next period (second SC period) after the first SC period, and transmits data to the group 1 using the radio resource indicated by the SCI.
  • the UE 100-1 transmits the SCI to other groups.
  • the UE 100-1 After transmitting the SCI to all of the plurality of groups, the UE 100-1 transmits the next SCI in order to transmit the next data to the group 1 (in the sixth SC period).
  • the UE 100-1 has a problem that a delay occurs for a time of “(SC period length) ⁇ (number of destinations ⁇ 1)”.
  • an object of the present application is to solve the above-described problems by the technique described below.
  • movement) which UE100 demonstrated below performs at least any one of the receiver 110 with which UE100 is equipped, the transmitter 120, and the controller 130, it demonstrates as a process which UE100 performs for convenience.
  • at least one of the receiver 210, the transmitter 220, the controller 230, and the network interface (backhaul communication unit) 240 included in the eNB 200 executes the process (operation) executed by the eNB 200 described below. Will be described as a process to be executed.
  • FIG. 8 is a diagram for explaining the operating environment according to the first embodiment.
  • UE 100-1 is located in a cell managed by eNB 200.
  • the UE 100-1 can execute cellular communication (LTE-Uu) with the eNB 200.
  • UE 100-1 is in the RRC connected state.
  • the UE 100-1 may be in the RRC idle state.
  • the UE 100-1 may shift from the RRC idle state to the RRC connected state.
  • the UE 100-1 is a relay UE that serves a plurality of UEs 100 (UEs 100-2 to 100-4) that are remote UEs.
  • the destinations of the plurality of UEs 100 that is, destination identifiers (Destination IDs) are different from each other.
  • Mode 1 A case where the UE 100-1 performs direct communication in the mode 1 in which the eNB 200 designates radio resources for direct communication will be described. The first to third methods applicable in mode 1 will be described.
  • FIG. 9 is a sequence diagram for explaining an operation (part 1) according to the first embodiment.
  • step S101 the eNB 200 assigns (sets) a plurality of SL-RNTIs (SL-RNTIs 1 and 2) to the UE 100-1.
  • SL-RNTI Sidelink Radio Network Temporary Identifier
  • DCI Downlink Control Information
  • SL-RNTI is a dedicated identifier for side link transmission.
  • DCI (DCI format 5) is control information for side link transmission.
  • the DCI includes an SL grant including radio resource allocation information. Note that the DCI format 5 includes information that is directly included in the SCI format 0 and resource information for sending the SCI format 0.
  • the eNB 200 may allocate a plurality of SL-RNTIs to the UE 100-1 when executing RRC connection reconfiguration.
  • the eNB 200 may assign a plurality of SL-RNTIs to the UE 100-1 when the UE 100-1 is a relay UE.
  • the eNB 200 may determine whether or not the UE 100-1 is a relay UE based on the notification from the UE 100-1.
  • the eNB 200 may assign a plurality of SL-RNTIs to the UE 100-1 when the number of destinations that the UE 100-1 has exceeds a predetermined value.
  • the eNB 200 may assign a plurality of SL-RNTIs to the UE 100-1 when the number of remote UEs served by the UE 100-1 exceeds a predetermined value.
  • the eNB 200 may assign a plurality of SL-RNTIs to the UE 100-1 so that a search space of the plurality of SL-RNTIs is associated with a specific SL-RNTI. For example, the eNB 200 can assign a plurality of consecutive SL-RNTIs to the UE 100-1.
  • the eNB 200 reserves radio resources for each of the plurality of SL-RNTIs. As a result, the eNB 200 reserves a plurality of radio resources for the UE 100-1.
  • the eNB 200 includes each secured radio resource allocation information in each DCI. Thereby, eNB200 produces
  • the eNB 200 transmits a plurality of DCIs (DCI1, DCI2) corresponding to the plurality of SL-RNTIs to the UE 100-1.
  • the eNB 200 transmits a plurality of DCIs before a predetermined SC period starts (specifically, before 4 subframes).
  • the eNB 200 may arrange a plurality of DCIs in a search space associated with a specific SL-RNTI.
  • the UE 100-1 receives a plurality of DCIs based on a plurality of SL-RNTIs.
  • the UE 100-1 may receive a plurality of DCIs by searching only a search space associated with a specific SL-RNTI.
  • the processing load on the UE 100-1 can be reduced.
  • the UE 100-1 Since the UE 100-1 receives a plurality of DCIs before the start of a predetermined SC period, the UE 100-1 determines radio resources used for transmission of each data based on allocation information included in each of the plurality of DCIs. The UE 100-1 generates an SCI including the determined radio resource allocation information. Specifically, UE 100-1 generates SCI1 including radio resource allocation information for data transmission of UE 100-2, and generates SCI2 including radio resource allocation information for data transmission of UE 100-3. To do. SCI1 includes a destination identifier addressed to UE 100-2, and SCI2 includes a destination identifier addressed to UE 100-3.
  • the UE 100-1 transmits a plurality of SCIs to the UE 100-2 and the UE 100-3. Thereafter, the UE 100-1 transmits the data of the UE 100-2 and the data of the UE 100-3 based on the allocation information of each radio resource.
  • the UE 100-2 receives the data of the UE 100-2 based on the radio resource allocation information included in the SCI 1 addressed to the UE 100-2.
  • the UE 100-3 receives the data of the UE 100-3 based on the allocation information of the radio resource included in the SCI 2 addressed to the UE 100-3.
  • the UE 100-1 can transmit a plurality of SCIs in one SC period, it is possible to suppress a delay in data transmission. Moreover, since eNB200 has allocated the radio
  • FIG. 10 is a sequence diagram for explaining the operation (part 2) according to the first embodiment.
  • FIG. 11 is a diagram illustrating an example of an extended DCI format for explaining the operation (part 2) according to the first embodiment.
  • step S201 the eNB 200 assigns a single SL-RNTI to the UE 100-1.
  • ENB 200 reserves a plurality of radio resources in one radio resource pool.
  • a plurality of radio resources means a plurality of radio resources in the SC pool and a plurality of radio resources in the data pool in principle.
  • Multiple radio resources does not mean a plurality of radio resources configured by a single radio resource in the SC pool and a single radio resource in the data pool.
  • ENB 200 generates DCI 1 including allocation information and index 1 of the secured first radio resource. Moreover, eNB200 produces
  • the (extended) DCI format includes “Resource pool index” corresponding to an index.
  • the index indicates whether or not a plurality of radio resources can be used in one SC period. That is, the index indicates whether or not a plurality of SCIs can be transmitted simultaneously.
  • the index is an integer, for example, and can take a value of 1 to the maximum number of simultaneous transmission SCIs.
  • “Resource for PSCCH” is a PSCCH resource allocation identifier.
  • “TPC command for PSCCH & PSSCH” is transmission power information.
  • “Frequency hopping flag” is frequency hopping information.
  • “Resource block assignment & hopping resource allocation” is frequency direction resource allocation information.
  • “Time resource pattern” is time direction subframe allocation pattern information. “Resource for PSCCH”, “Frequency hopping flag”, “Resource block assignment & hopping resource allocation”, and “Time resource pattern” constitute an SL grant.
  • step S202 the eNB 200 transmits a plurality of DCIs.
  • the UE 100-1 receives a plurality of DCIs.
  • the UE 100-1 acquires the radio resource allocation information 1 included in the DCI 1 and the radio resource allocation information 2 included in the DCI 2.
  • the UE 100-1 determines whether the second radio resource based on the allocation information 2 acquired next can be used as well as the first radio resource based on the allocation information 1 acquired first. . Specifically, UE 100-1 determines whether or not index 1 included in DCI1 and index 2 included in DCI2 are different values. When these indexes have different values, the UE 100-1 determines that not only the first radio resource but also the second radio resource can be used. On the other hand, when these indexes have the same value, the UE 100-1 overwrites the information of DCI1 with the information of DCI2.
  • the index is not included in DCI.
  • the UE When the UE receives a new DCI, the UE overwrites the held DCI information with the new DCI information.
  • Step S203 corresponds to step S103.
  • the UE 100-1 can be assigned a plurality of radio resources, it is possible to suppress a delay in data transmission. Moreover, since eNB200 has allocated the radio
  • FIG. 12 is a sequence diagram for explaining the operation (part 3) according to the first embodiment.
  • FIG. 13 is a diagram illustrating an example of an extended DCI format for explaining the operation (part 3) according to the first embodiment.
  • step S301 the eNB 200 assigns a single SL-RNTI to the UE 100-1.
  • ENB 200 reserves a plurality of radio resource pools in one radio resource pool.
  • the eNB 200 generates DCI including a plurality of allocation information composed of allocation information for each of the plurality of radio resource pools. Specifically, the eNB 200 generates DCI including a plurality of SL grants (see thick frames) corresponding to a plurality of allocation information.
  • the (extended) DCI format includes a plurality of SL grants.
  • one SL grant is composed of “Resource for PSCCH”, “Frequency hopping flag”, “Resource block assignment & hopping resource allocation”, and “Time resource indicator”.
  • the SL grant may not include the “Resource pool index” (index).
  • ENB200 sets the index corresponding to each allocation information of a some radio
  • step S302 the eNB 200 transmits one DCI, and the eNB 200 receives one DCI.
  • the UE 100-1 acquires allocation information of a plurality of radio resources included in the DCI.
  • Step S303 corresponds to step S103.
  • the UE 100-1 can be assigned a plurality of radio resources, it is possible to suppress a delay in data transmission. Moreover, since eNB200 has allocated the radio
  • FIG. 14 is a sequence diagram for explaining the operation (part 4) according to the first embodiment.
  • FIG. 15 is a diagram illustrating an example of SCI assignment for explaining the operation (part 4) according to the first embodiment.
  • the eNB 200 transmits setting information for setting the radio resource pool used in mode 2 to the UE 100-1, to the UE 100-1.
  • the UE 100-1 sets a radio resource pool based on the setting information.
  • the UE 100-1 may set a radio resource pool set in advance.
  • the radio resource pool set here may be a radio resource pool capable of simultaneously transmitting a plurality of control information.
  • the eNB 200 transmits permission information permitting use of a radio resource pool capable of transmitting a plurality of control information in one SC period (or simultaneously) to the UE 100-2.
  • the eNB 200 transmits permission information that permits transmission of a plurality of control information in one SC period (or simultaneously) to the UE 100-2 in the set radio resource pool.
  • the eNB 200 may transmit permission information together with setting information.
  • the eNB 200 may transmit permission information to the UE 100-2 when the UE 100-1 is a relay UE.
  • the eNB 200 may determine whether or not the UE 100-1 is a relay UE based on the notification from the UE 100-1.
  • the eNB 200 may transmit permission information to the UE 100-2 when the number of destinations of the UE 100-1 exceeds a predetermined value.
  • the eNB 200 may transmit the permission information to the UE 100-2 when the number of remote UEs served by the UE 100-1 exceeds a predetermined value.
  • the UE 100-1 When the UE 100-1 does not receive permission information from the eNB 200, the UE 100-1 selects a radio resource for transmitting one control information from a plurality of set radio resource pools.
  • the UE 100-1 that has received the permission information from the eNB 200 can select a plurality of radio resources from the set radio resource pool according to the permission from the eNB 200.
  • the UE 100-1 preferably selects radio resources so that a plurality of SCIs do not collide in the time direction. Thereby, the release 12 terminal can also receive, and backward compatibility is ensured.
  • Step S403 corresponds to step S103.
  • the UE 100-1 can select a plurality of radio resources, it can transmit a plurality of SCIs in one SC period (or simultaneously). For this reason, it can suppress that the delay of data transmission generate
  • FIG. 16 is a diagram for explaining the operation (part 5) according to the first embodiment.
  • the method for selecting a radio resource for data transmission can be applied in either mode 1 or mode 2.
  • each of the plurality of radio resources overlaps with each other in the time direction. Choose not to be. This can solve the PAPR (Peak to Average Power Ratio (1 peak power to average power ratio)) problem.
  • FIG. 17 is a diagram illustrating an example of an extended SCI format for explaining the operation (part 1) according to the second embodiment.
  • FIG. 18 is a diagram illustrating an example of an extended DCI format for explaining an operation (part 1) according to the second embodiment.
  • the SCI storage field is changed, and an extended SCI including allocation information for a plurality of destinations (Destination IDs) is used.
  • the extended SCI includes a plurality of radio resource allocation information (see thick frames).
  • Allocation information includes, for example, “Frequency hopping flag”, “Resource block assignment & hopping resource allocation”, “Time resource pattern”, and “Modulation & coding MC” (Modulation & codingScheme).
  • the extended SCI includes a plurality of sets including a set of allocation information and a destination identifier (group destination ID) corresponding to the allocation information.
  • Time advance indication is a correction value related to transmission timing.
  • Numberer of destinations indicates the upper limit of data resources that one extended SCI can specify simultaneously. That is, “Number of destinations” indicates the maximum number of allocation information included in the extended SCI. In the example of FIG. 17, the extended SCI may include 16 pieces of allocation information.
  • the UE 100-1 selects a plurality of radio resources and generates an extended SCI.
  • the UE 100-1 can execute the following method to generate the enhanced SCI.
  • the UE 100-1 can apply an MCS having a higher transmission rate to the extended SCI than the MCS applied to the SCI applied to the existing SCI including one piece of allocation information.
  • the UE 100-1 may allocate a larger amount of radio resources than the existing SCI for transmission of the extended SCI.
  • the UE 100-1 can transmit the enhanced SCI using the allocated radio resource.
  • the UE 100-1 transmits the generated extended SCI including the allocation information of each of the plurality of radio resources to a plurality of destinations.
  • the UE 100-1 may select a radio resource for transmitting the enhanced SCI from a preset radio resource pool.
  • the UE 100-1 can acquire the extended SCI even for UEs outside the network area.
  • the UE 100-1 may select the radio resource from the radio resource pool notified by the relay UE. For example, when the UE 100-1 is a relay UE, the UE 100-1 notifies the remote UE of the radio resource pool.
  • the UE 100-1 can select a radio resource for transmitting the extended SCI from the notified radio resource pool. Thereby, the remote UE can acquire the extended SCI.
  • DCI includes allocation information for one SCI transmission (parameters: “Resource for PSCCH”, “TPC command for PSCCH & PSSCH”, “Frequency hopping flag”), Includes allocation information for multiple data (parameters: “Resource block assignment & hopping resource allocation”, “Time resource pattern”, “Resource pool index”).
  • the UE 100-1 selects a radio resource for data transmission as described in the first embodiment.
  • FIG. 19 is a diagram for explaining the operation (part 2) according to the second embodiment.
  • the UE 100-1 extends a packet (MAC PDU (MAC Protocol Data Unit)), and includes each data of a plurality of destinations in the packet (that is, multiplexes a plurality of data into the MAC PDU). ). Therefore, the UE 100-1 generates a packet including a plurality of data including data of a plurality of destinations. Further, the UE 100 notifies a plurality of receiving UEs (UEs 100-2 to 100-4) that the packet includes data of a plurality of destinations by using a special destination identifier.
  • MAC PDU MAC Protocol Data Unit
  • the UE 100-1 receives a packet by a special destination identifier (for example, a special L1 destination ID) indicating that a plurality of data of a plurality of destinations are included in the packet, and a plurality of receiving UEs corresponding to the plurality of destinations.
  • SCI including radio resource allocation information is transmitted.
  • the special destination identifier is, for example, a broadcast identifier.
  • the special destination identifier may be composed of at least a part of the identifier used when the UE 100-1 is a relay terminal. Therefore, the special destination identifier may be such that remote UEs connected to the same UE 100 (the same relay UE) can recognize that the special destination identifier is the same.
  • the special destination identifier may be an L2 Relay UE ID that is an identifier of the relay UE.
  • the special destination identifier may be a part of the relay UE identifier (Relay UE ID).
  • the special destination identifier may be the MSB (Most Significant Bit) of the relay UE identifier (Relay UE ID).
  • the remote UE uses, as a special destination identifier, the MSB (for example, the first 8 bits) of the relay UE identifier (Relay UE ID) notified from the relay UE by the discovery signal (Relay Discovery).
  • the MSB for example, the first 8 bits
  • the relay UE ID the relay UE identifier notified from the relay UE by the discovery signal (Relay Discovery).
  • the relay UE uses the MSB of the relay UE identifier (Relay UE ID) and the MSB of its own L2 UE ID (for example, the first 16 bits) as the relay UE's own destination identifier.
  • a new identifier (Remote UE's L2 ID) combined with LSB (Last Significant Bit: last significant bit) may be generated. The new identifier may be used.
  • the UE 100-1 can recognize the special destination identifier even if the UE 100-1 does not notify the other UE (for example, a remote UE) of the special destination identifier. Therefore, when the other UE receives the SCI including the special destination identifier from the UE 100-1, it can be seen that the SCI includes allocation information of data of a plurality of destinations. Therefore, other UEs do not have to discard the allocation information even when the allocation information is not directed to their destination.
  • (F) Third Method A third method will be described.
  • the UE 100-1 similarly to the second method, the UE 100-1 generates a packet including a plurality of data including data of a plurality of destinations.
  • the UE 100-1 notifies other UEs of destination identifiers (L1 destination IDs) for receiving data for a plurality of destinations before transmitting the SCI.
  • the UE 100-1 may use a discovery signal (discovery message) to notify the destination identifier.
  • the other UE when the other UE receives the SCI including the destination identifier, it can be seen that the SCI includes allocation information of data of a plurality of destinations. Therefore, other UEs do not have to discard the allocation information even when the allocation information is not directed to their destination.
  • FIG. 20 is a diagram illustrating an example of an extended SCI format for explaining the operation (part 4) according to the second embodiment.
  • UE 100-1 transmits an (extended) SCI including a plurality of destination identifiers and allocation information for receiving a packet.
  • the extended SCI includes, for example, “Number of destinations” indicating the number of destinations and “Group destination ID” which is a plurality of destination identifiers.
  • the extended SCI format can store a maximum of 16 (4 bits) destination identifiers (destination ID).
  • the other UEs that have received the extended SCI receive data based on the allocation information when the plurality of destination identifiers in the extended SCI have their own destination identifiers. On the other hand, when the other UEs do not have their own destination identifier among the plurality of destination identifiers in the extended SCI, the other UE can discard the allocation information.
  • the eNB 200 When applying the second to fourth methods according to the second embodiment described above to mode 1, the eNB 200 needs to transmit allocation information to a plurality of destinations to the UE 100. For this reason, the same operation as that described above is executed.
  • FIG. 21 is a diagram for explaining the operation (part 5) according to the second embodiment.
  • FIG. 22 is a diagram for explaining the operation (No. 6) according to the second embodiment.
  • a destination identifier (special destination identifier) indicating that a packet includes data of a plurality of destinations or another UE (hereinafter referred to as UE 100-2) that receives the SCI including the plurality of destination identifiers
  • the packet is received based on the allocation information included in the.
  • the UE 100-2 may continue to receive the packet until the packet does not include its own data. Therefore, reception of unnecessary packets is reduced by the following method.
  • the UE 100-2 when the UE 100-2 does not include its own data, the UE 100-2 omits reception of a packet retransmitted from the UE 100-1. Specifically, if the received MAC PDU does not include its destination MAC SDU (Service Data Unit), the UE 100-2 omits reception of the retransmitted MAC PDU (that is, does not receive). .
  • MAC SDU Service Data Unit
  • the UE 100-2 if the UE 100-2 does not include its own data in the first packet in one radio resource pool, the UE 100-2 omits subsequent packet reception. Also, the UE 100-2 discards the allocation information. The UE 100-1 can terminate the HARQ process faster by discarding the allocation information.
  • the UE 100-2 determines the first MAC PDU (packet in the next subframe of the SC pool in FIG. 21) based on allocation information indicating the arrangement of a plurality of packets arranged differently in the time direction. Receive. If the UE 100-2 does not store its own destination in the first received MAC PDU, the UE 100-2 omits (ignores) reception of subsequent packets. Also, the UE 100-2 discards the corresponding allocation information.
  • the UE 100-1 transmits only data corresponding to a plurality of destination identifiers (Destination IDs 1, 3, and 4) included in the first packet in one radio resource pool.
  • the UE 100-1 does not change the destination in one radio resource pool as described below.
  • the UE 100-2 receives a packet (MAC PDU) transmitted at a timing at which a plurality of data destinations can be changed, and determines whether or not to omit the subsequent packet reception.
  • MAC PDU packet
  • the UE 100-1 transmits timing information indicating a timing at which a plurality of destinations included in the MAC PDU can be changed within a predetermined period (within one radio resource pool).
  • the UE 100-2 receives the timing information.
  • the UE 100-1 may store the timing information as a MAC CE (Control Element) that stores the first MAC PDU.
  • the UE 100-2 receives the first MAC PDU.
  • the UE 100-2 continues to receive until the next timing (Reception timing) in which a plurality of destinations can be changed.
  • the UE 100-2 if the UE 100-2 does not store its own destination in the first MAC PDU, the UE 100-2 omits (ignores) reception of the MAC PDU until the next timing based on the timing information. Note that the UE 100-2 continues to hold the allocation information until the last timing described later.
  • the UE 100-2 receives the MAC PDU at the next timing based on the timing information, and determines whether or not its destination (identifier) is stored in the received MAC PDU. In FIG. 22, the UE 100-2 receives the MAC PDU based on the allocation information because its destination is stored in the received MAC PDU.
  • the UE 100-2 receives the MAC PDU at a timing at which a plurality of destinations can be changed based on the timing information.
  • the timing is the last timing indicated by the timing information. Since its own destination is not stored in the MAC PDU, the UE 100-2 omits subsequent reception of the MAC PDU. Also, the UE 100-2 discards the allocation information before the predetermined period (one radio resource pool) ends. The UE 100-1 can finish the HARQ process faster by discarding the allocation information before one radio resource pool is finished.
  • FIG. 23 is a diagram for explaining the operation (part 7) according to the second embodiment.
  • the relay UE sets different logical channel identification information (LCID) for each of a plurality of destinations. Specifically, the relay UE sets LCID1 to the remote UE (A) and sets LCID2 to the remote UE (B). LCIDs 3 and 4 are not used. Thus, the relay UE stores the LCID and the destination (destination ID) in association with each other.
  • LCID logical channel identification information
  • the relay UE carries data (MAC SDU) of each of a plurality of destinations on a logical channel corresponding to the LCID. Thereby, the relay UE carries the data of the remote UE (A) on the logical channel corresponding to LCID1. Since the remote UE (A) is set with LCID1, the remote UE (A) recognizes the data carried on the logical channel corresponding to LCID1 as its own data, and acquires the data.
  • MAC SDU data of each of a plurality of destinations on a logical channel corresponding to the LCID.
  • the relay UE carries the data of the remote UE (A) on the logical channel corresponding to LCID1. Since the remote UE (A) is set with LCID1, the remote UE (A) recognizes the data carried on the logical channel corresponding to LCID1 as its own data, and acquires the data.
  • the relay UE notifies the usage status of the LCID to the remote UE (C). For example, the relay UE transmits a bitmap (see FIG. 23) indicating the LCID usage status to the remote UE (C).
  • the relay UE may transmit the bitmap by a discovery message having an LCID field indicating the LCID usage status.
  • a bit map indicating the usage status of the LCID may be stored in the LCID field.
  • the remote UE (C) selects an LCID that is not used based on a bitmap indicating the usage status of the LCID. For example, the remote UE (C) determines to select LCID3.
  • the remote UE (C) notifies the selected LCID3 to the relay UE.
  • the relay UE starts carrying data of the remote UE (C) on the logical channel corresponding to LCID3.
  • the relay UE since the relay UE carries data (MAC SDUs) of a plurality of destinations on a logical channel corresponding to the LCID, a plurality of data can be transmitted simultaneously.
  • (J) Mode 1 A case where the UE 100-1 performs direct communication in the mode 1 in which the eNB 200 designates radio resources for direct communication will be described.
  • the first and second methods applicable in mode 1 will be described. Since the first method is similar to the “(A1) first method” according to the first embodiment, the description will focus on different parts.
  • the second method is similar to the “(A2) second method” according to the first embodiment, and therefore, different parts will be mainly described.
  • FIG. 24 is a sequence diagram for explaining an operation (part 1) according to the third embodiment.
  • step S501 the eNB 200 sets (assigns) a plurality of different sets (Mode 1 transmission settings) including sets (combinations) of SL-RNTIs and transmission resource pools to the UE 100-1.
  • the UE 100-1 sets a plurality of Mode 1 transmission settings. Thereby, a plurality of SL-RNTIs are assigned to the UE 100-1.
  • ENB 200 reserves radio resources for each of a plurality of SL-RNTIs.
  • the eNB 200 reserves radio resources in the radio resource pool corresponding to SL-RNTI.
  • the eNB 200 assigns a plurality of SL-RNTIs to the UE 100-1 so that a search space of the plurality of SL-RNTIs is associated with a specific SL-RNTI, as in the “(A1) first method” described above. It may be assigned. Further, the eNB 200 may arrange a plurality of DCIs in a search space associated with a specific SL-RNTI.
  • Step S502 corresponds to step S102.
  • the eNB 200 transmits a plurality of DCIs including DCIs corresponding to the plurality of Mode 1 transmission settings to the UE 100-1.
  • the UE 100-1 receives a plurality of DCIs based on the plurality of SL-RNTIs.
  • the UE 100-1 is assigned a plurality of radio resources including radio resources in a transmission resource pool corresponding to each of the plurality of SL-RNTIs.
  • Step S503 corresponds to step S103.
  • the UE 100-1 can be assigned a plurality of radio resources, it is possible to suppress a delay in data transmission. Moreover, since eNB200 has allocated the radio
  • FIG. 25 is a sequence diagram for explaining the operation (part 2) according to the third embodiment.
  • FIG. 26 is a diagram for explaining the operation (part 2) according to the third embodiment.
  • step S601 the eNB 200 sets (assigns) a single SL-RNTI, a plurality of radio resource pools associated with the SL-RNTI, and indexes of the plurality of radio resource pools to the UE 100-1. ).
  • the eNB 200 may notify the UE 100-1 of the correspondence relationship between a plurality of radio resource pools and indexes by broadcasting.
  • the UE 100-1 associates and sets SL-RNTI and a plurality of radio resource pools.
  • step S602 the eNB 200 transmits a plurality of DCIs, and the UE 100-1 receives the plurality of DCIs. As a result, the UE 100-1 acquires the radio resource allocation information 1 included in the DCI 1 and the radio resource allocation information 2 included in the DCI 2.
  • the UE 100-1 is assigned radio resources in the radio resource pool (Pool 1) indicated by the index 1 included in the DCI 1 based on the assignment information 1. Based on the allocation information 2, the UE 100-2 is allocated radio resources in the radio resource pool (Pool 2) indicated by the index 2 included in the DCI 2.
  • Step S603 corresponds to step S103.
  • the UE 100-1 can be assigned a plurality of radio resources, it is possible to suppress a delay in data transmission. Moreover, since eNB200 has allocated the radio
  • the information indicating the index may be a time position where the allocation information of the radio resource is arranged. That is, the radio resource pool may be designated by the SL grant (DCI) notification timing.
  • DCI SL grant
  • the UE 100-1 may determine which radio resource pool corresponds to the SL grant notified at a predetermined timing according to the following formula.
  • the eNB 200 transmits not the permission information, but information indicating whether or not a plurality of radio resource pools can be used simultaneously to 100-1.
  • the information is a list indicating combinations of radio resource pools that can be used simultaneously among a plurality of radio resource pools.
  • the information is a list indicating only radio resource pools that can be used simultaneously among the plurality of radio resource pools.
  • the radio resource pools listed in this list are radio resource pools that are allowed to be used simultaneously. In these lists, indexes associated with the radio resource pool may be described.
  • the UE 100-1 can transmit a plurality of SCIs using radio resources selected from each of a plurality of radio resource pools. For this reason, it can suppress that the delay of data transmission generate
  • the eNB 200 when the UE 100-1 relays data transmission / reception between the eNB 200 and the UE 100-2 (in other words, when operating as a relay UE), the eNB 200 (or a cell managed by the eNB 200, and so on) ) To notify the UE 100-1 of information on radio resources used for direct communication with the UE 100-2.
  • the eNB 200, the UE 100-1, and the UE 100-2 are in the first environment shown in FIG. 27A or the second environment shown in FIG.
  • the UE 100-1 and the UE 100-2 in the first environment will be described below.
  • UE 100-1 is located in a cell (serving cell) managed by eNB 200.
  • the UE 100-1 is in a state (RRC connection state) in which connection (RRC connection) is established with the eNB 200.
  • RRC connection state a state in which connection (RRC connection) is established with the eNB 200.
  • the UE 100-1 has a capability of relaying data transmission / reception between the eNB 200 and the UE 100-2 by direct communication (D2D communication) with the UE 100-2. That is, the UE 100-1 has a capability of functioning as a relay UE.
  • D2D communication direct communication
  • the UE 100-2 is not located in a cell managed by eNB 200.
  • the UE 100-2 is in a state where a connection (RRC connection) is not established with the eNB 200. Further, as described above, the UE 100-2 has a function of indirectly transmitting / receiving data to / from the eNB 200 via the UE 100-1. That is, the UE 100-2 has a capability of functioning as a remote UE.
  • the UE 100-1 is located in a cell managed by the eNB 200, as in the first environment.
  • the UE 100-1 is in a state of establishing a connection with the eNB 200.
  • the UE 100-2 resides in a cell (serving cell) managed by the eNB 200.
  • the UE 100-2 is in a state (RRC connection state) in which connection (or RRC connection) is established with the eNB 200.
  • step S701 the eNB 200 determines a UE (relay UE) that relays data transmission / reception with the UE 100-2 as the UE 100-1.
  • a UE relay UE
  • a sixth embodiment described later may be used as a method for determining the relay UE by the eNB 200.
  • step S702 the eNB 200 selects either mode 1 or mode 2 as the resource allocation type for direct communication with the UE 100-1.
  • the eNB 200 may select the mode 2 when at least one of the following conditions is satisfied.
  • the eNB 200 may select the mode 1 when not satisfying all the following conditions.
  • the processing load of the eNB 200 is a predetermined value or more.
  • the capacity of the physical downlink control channel (PDCCH) radio resource is equal to or less than a predetermined value
  • the eNB 200 transmits an RRC Connection Reconfiguration message including setting information regarding the mode (mode 1 or mode 2) selected in step S702 to the UE 100-1. Specifically, for example, when mode 1 is selected in step S702, the eNB 200 transmits the SL-ComConfig scheduled in the RRC Connection Reconfiguration message including a bit. On the other hand, for example, when the mode 2 is selected in step S702, the eNB 200 includes the bit in the SL-CommConfig ue-Selected in the RRC Connection Reconfiguration message.
  • the UE 100-1 applies the setting information included in the RRC Connection Reconfiguration message transmitted from the eNB 200 in step S703. As a result, the UE 100-1 recognizes which of the mode 1 and the mode 2 is the type of the radio resource for direct communication allocated to the own terminal.
  • the eNB 200 transmits information (DCI format 5 or the like) for specifying a radio resource via the PDCCH after transmitting the RRC Connection Reconfiguration message in step S703.
  • the eNB 200 includes information for specifying the radio resource to be allocated in the RRC Connection Reconfiguration message. For this reason, it becomes unnecessary for eNB200 to transmit the information for specifying a radio
  • step S704 the UE 100-1 performs relay control for relaying data between the remote UE UE 100-2 and the eNB 200 using the direct communication radio resource allocated by the eNB 200.
  • the eNB 200 selects an optimal mode according to whether it is not desirable to separately transmit information for specifying the radio resource for the UE 100-1, and realizes relay control via the UE 100-1. Can do.
  • the eNB 200 directly accesses the UE 100-1 according to the mode selected by the eNB 200 in step S702 and the environment of the UE 100-2 (that is, whether or not the UE 100-2 is located in a cell managed by the eNB 200).
  • An example of communication radio resource allocation will be described with reference to FIGS.
  • the UE 100-2 can use the direct communication radio resource ( Use some or all of the radio resources in the resource pool.
  • the UE 100-2 relates to direct communication radio resources that can be used by the UE 100-2 in direct communication radio resources stored in advance in the UE 100-2 (for example, a SIM (Subscriber Identity Module Card) of the UE 100-2). It specifies based on information (mode2DataOffsetIndicator and mode2DataSubframeBitmap etc. in Preconfigured parameters).
  • mode2DataOffsetIndicator is an offset value in the time direction, and indicates the start position of data transmitted using the radio resource of mode 2 from the start position of saPeriod (period in which radio resources are allocated by the side link).
  • the mode2DataSubframeBitmap indicates a radio resource subframe that can be used by the UE 100-2.
  • the eNB 200 stores in advance the same information as the information related to the radio resources stored in advance in the UE 100-2, received from the UE 100-2 at the time of authentication of the UE 100-2 in the past, or manages the UE 100-2 By requesting and acquiring the server, the UE 100-2 knows the radio resources for direct communication that can be used.
  • the eNB 200 does not overlap the temporal position (subframe) of the direct communication radio resource allocated to the UE 100-1 with the temporal position (subframe) of the direct communication radio resource usable for the UE 100-2 (in other words, Sub-frames of direct communication radio resources allocated to UE 100-1 so that radio resources used for direct communication allocated to UE 100-1 and radio resources used for UE 100-2 are orthogonal in time).
  • the pattern (time resource pattern) is selected.
  • ”A the time resource pattern of UE 100-1, a pattern in which bits in the same subframe do not overlap (for example, ⁇ 0, 1, 0, 1, 0, 1... ⁇ , ⁇ 0, 1, 0, 1, 0, 0... Or ⁇ 0, 0, 0, 1, 0, 1.
  • mode2DataOffsetIndicator 1 of UE 100-2
  • eNB 200 has a start position of data transmitted / received using mode 2 radio resources different from a start position of data transmitted / received using mode 1 radio resources. .
  • FIG. 29 illustrates an example of direct communication radio resources allocated to the UE 100-1 so that the eNB 200 does not overlap with the direct communication radio resources usable by the UE 100-2.
  • the horizontal axis is the time axis, and the radio resources in the PSSCH of the UE 100-1 and the UE 100-2 do not overlap in the time direction.
  • ENB200 transmits the information (DCI format5) containing the subframe pattern (time resource pattern) of the radio
  • UE 100-1 Upon receiving DCI format 5, UE 100-1 performs relay control in step S704 using a radio resource corresponding to the subframe pattern of the radio resource for direct communication assigned to UE 100-1.
  • the eNB 200 In the eNB 200, the temporal positions (subframes) of the radio resources used for direct communication assigned to the UE 100-1 and the UE 100-2 do not overlap each other (in other words, the radio resource assigned to the UE 100-1 and the radio resource assigned to the UE 100-2).
  • the radio resource subframe pattern (time resource pattern) to be allocated to the UE 100-1 and the UE 100-2 is selected so that the resources are orthogonal to each other in time. Specifically, for example, when the eNB 200 selects ⁇ 0, 1, 0, 1, 0, 1 ⁇ for the time resource pattern of the UE 100-1, the eNB 200 sets ⁇ 1, 0, 1 to the time resource pattern of the UE 100-2. , 0, 1, 0 ⁇ . That is, the eNB 200 selects each other's time resource pattern so that the bits of the same subframe of the time resource pattern of the UE 100-1 and the time resource pattern of the UE 100-2 do not overlap each other.
  • FIG. 30 shows an example of radio resources for direct communication allocated by the eNB 200 to the UE 100-1 and the UE 100-2.
  • the horizontal axis is the time axis.
  • the radio resources in the PSSCH of the UE 100-1 and the UE 100-2 do not overlap in the time direction.
  • the eNB 200 transmits information (DCI format 5) including a subframe pattern (time resource pattern) of radio resources for direct communication to be assigned to the previously selected UE 100-1 and UE 100-2 by the PDCCH. 1 and UE 100-2.
  • information DCI format 5 including a subframe pattern (time resource pattern) of radio resources for direct communication to be assigned to the previously selected UE 100-1 and UE 100-2 by the PDCCH. 1 and UE 100-2.
  • the eNB 200 transmits the DCI format 5 to the UE 100-1 and the UE 100-2 at predetermined timings, respectively. Specifically, after step S703 shown in FIG. 28, the eNB 200, for the UE 100-1, a subframe before a subframe before a predetermined subframe (for example, 4 subframes) before the start position of saPeriod (For example, DCI format5 is transmitted in a subframe five subframes before. On the other hand, the eNB 200 transmits a subframe before a predetermined subframe (for example, four subframes) from the start position of saPeriod to the UE 100-2.
  • a subframe before a subframe for example, four subframes
  • DCI format 5 is transmitted, whereby radio resources allocated to UE 100-1 are included in saPeriod as shown in FIG. With respect to UE100-1 Ri to the next saPeriod after saPeriod that against which radio resources are contained, so that can fit the radio resource allocated for UE 100-2.
  • the temporal position (subframe) of the radio resource allocated to the UE 100-1 and the temporal position (subframe) of the radio resource allocated to the UE 100-2 should not overlap each other. Can do. As a result, the UE 100-1 and the UE 100-2 can avoid overlapping transmission / reception timings during relay control.
  • the eNB 200 sets the time positions (subframes) of radio resources that can be selected by the UE 100-1 for use in direct communication by the UE 100-1 to the time of radio resources used for direct communication set in the UE 100-2 in advance.
  • the subframes of radio resources that can be selected by the UE 100-1 are set so that the UEs 100-1 are orthogonal in time.
  • the subframes of radio resources that can be selected by the UE 100-1 are set so that the bits of the subframes do not overlap each other.
  • the eNB 200 transmits the radio resource subframes (mode2DataOffsetIndicator and mode2DataSubframeBitmap) selectable by the UE 100-1 set as described above in the RRC Connection Reconfiguration message in step S703. Accordingly, as shown in FIG. 32, the position of the resource that can be used for the direct communication of the UE 100-1 and the position of the resource that can be used for the direct communication of the UE 100-2 do not overlap each other. Therefore, it is possible to prevent collision of direct communication between the UE 100-1 and the UE 100-2 during relay control.
  • the radio resource subframes mode2DataOffsetIndicator and mode2DataSubframeBitmap
  • the radio that can be selected by the UE 100-1 so as not to overlap with the radio resource (resource pool) of the other relay UE Resource subframes can be set.
  • the UE 100-1 can avoid the timing of direct communication with other relay UEs in addition to the UE 100-2 from overlapping.
  • the fourth embodiment can be similarly applied to radio resource allocation in Sidelink Control (PDSCH).
  • PDSCH Sidelink Control
  • the eNB 200 can select a radio resource to be used by the UE 100-1 that is allocated to the UE 100-1 for direct communication between the UE 100-1 and the UE 100-2 or transmission of a discovery signal. It relates to the setting of resource (resource pool) priority.
  • the example of the environment according to the fifth embodiment is the same as the example of the environment according to the fourth embodiment (example of the environment shown in FIG. 27). Further, the fifth embodiment may be an embodiment in which a part of the operation is added to the fourth embodiment, or may be an embodiment independent of the fourth embodiment.
  • the eNB 200 sets a priority for each resource pool in a plurality of resource pools allocated to the UE 100-1.
  • the priority is for specifying which resource pool should be used preferentially by the UE to which each resource pool is assigned when the subframes of each resource pool overlap each other.
  • the plurality of resource pools include a resource pool for transmitting a discovery signal and a resource pool for direct communication with the UE 100-2.
  • the eNB 200 may determine the priority of the radio resource (resource pool) at the time of step S702 (selecting the type of resource to be allocated to the UE 100-1) according to the fourth embodiment. Good.
  • the eNB 200 may include information on the priority of the resource pool assigned to the RRC Connection Reconfiguration message transmitted to the UE 100-1 in step S703 of the fourth embodiment.
  • setting information of a plurality of resource pools may be included in one RRC Connection Reconfiguration message.
  • the setting information of the plurality of resource pools may include information on the priority of each resource pool.
  • the UE 100-1 Upon receiving the RRC Connection Reconfiguration message transmitted from the eNB 200 in step S703 of the sequence according to the fourth embodiment, the UE 100-1 uses each resource pool based on the priority of each resource pool included in the message.
  • the discovery signal is transmitted or the direct communication is executed.
  • the UE 100-1 sets the priority of the resource pool for transmitting the discovery signal to 1 in the received RRC Connection Reconfiguration message, and the priority of the resource pool for direct communication. Is set to 2, resource pools with high priority are used for positions (subframes) that overlap each other in the time direction. That is, UE 100-1 transmits a discovery signal using a resource pool for transmitting a discovery signal at a position where the resource pools overlap each other in the time direction.
  • the eNB 200 may determine the priority of each resource pool based on predetermined information.
  • the predetermined information is, for example, the type of service realized using each resource pool (report service, etc.) and the reception success rate, the group and user using the resource pool, and the amount of data transmitted using the resource pool. At least any one may be sufficient.
  • eNB200 may grasp
  • the eNB 200 can indirectly specify a resource pool to be used at a position where the resource pools overlap each other with respect to the UE 100-1 in a flexible manner. The use of different resource pools.
  • the eNB 200 sets the number of times (numRepetition) that the subframe pattern (time resource pattern) of the radio resource allocated to the UE 100-1 is repeated in the time direction May be.
  • the eNB 200 repeats the radio resource subframe pattern (time resource pattern) in the RRC Connection Reconfiguration message transmitted to the UE 100-1 in step S703 according to the sequence of the fourth embodiment ( numRepition) may be included.
  • the UE 100-1 recognizes that the number of times the subframe pattern (time resource pattern) of the allocated radio resource is repeated is 3 times. To do. That is, the UE 100-1 does not perform direct communication (or restricts direct communication) using the subframe after repeating the radio resource subframe three times in accordance with time resource pattern from the start of saPeriod.
  • the eNB 200 may include the number of repetitions (numRepetion) in the SCI format 0 that is transmitted by specifying the transmission timing by the DCI Format 5 that is transmitted via the PDCCH after the RRC Connection Reconfiguration message, instead of being included in the RRC Connection Reconfiguration message. .
  • the eNB 200 may also be applied when mode 2 is selected as a resource type to be allocated to the UE 100-1.
  • the UE 100-1 has completed the number of times when the radio resource allocated according to the mode2DataSubframeBitmap has been completed from the point where the mode2DataOffsetIndicator is added to the start point of the modePeriod included in the RRC Connection Reconfiguration message received from the eNB 200. Recognize that an allocated resource ends That is, the UE 100-1 does not recognize that the wireless resource allocated to itself after the point where the repetition count has expired and does not perform direct communication using the wireless resource (prohibit direct communication).
  • the eNB 200 can realize flexible radio resource allocation to the UE 100-1 by setting the number of repetitions for the radio resource allocated to the UE 100-1.
  • a pattern (time repetition pattern) in which a subframe pattern (time resource pattern) of a radio resource allocated to UE 100-1 is repeated in the time direction May be set.
  • the eNB 200 transmits the radio resource to the SCI format 0 that is transmitted by specifying the transmission timing by the DCI format 5 or the DCI format 5 transmitted via the PDCCH after the RRC Connection Reconfiguration message transmitted in step S703 in the fourth embodiment.
  • the UE 100-1 recognizes that the radio resource corresponding to the subframe pattern of the second and third radio resources is allocated to itself. That is, the UE 100-1 recognizes that the repetition position having the bit of time repetition pattern in the sub-frame pattern (time resource pattern) of the radio resource is the radio resource assigned to itself. On the other hand, the UE 100-1 recognizes that the repetition position having no time repetition pattern bit in the subframe pattern (time resource pattern) of the radio resource is not a radio resource assigned to itself. , Direct communication is not performed using the radio resource (direct communication is prohibited).
  • the eNB 200 can realize flexible radio resource allocation to the UE 100-1 by setting a repetitive pattern to radio resources to be allocated to the UE 100-1.
  • the sixth embodiment relates to an operation in which the eNB 200 determines a UE to be operated as a relay UE.
  • the UE 100-1, the UE 100-2, and the UE 100-3 are in the first environment shown in FIG. 33A or the second environment shown in FIG.
  • the UE 100-1 to UE 100-3 in the first environment will be described below.
  • UE 100-1 and UE 100-2 are in an environment similar to the first environment in the first embodiment. That is, UE 100-1 is located in a cell managed by eNB 200. The UE 100-2 is not located in a cell managed by the eNB 200.
  • the UE 100-3 is located in a cell managed by the eNB 200, like the UE 100-1.
  • the UE 100-3 has a capability of functioning as a relay UE.
  • the UE 100-1 and the UE 100-3 are the same environment as the first environment.
  • the UE 100-2 resides in a cell (serving cell) managed by the eNB 200.
  • the UE 100-2 is in a state (RRC connection state) in which connection (or RRC connection) is established with the eNB 200.
  • a plurality of examples of operations of the eNB 200 and the UEs 100-1 to 100-3 when the eNB 200 in the sixth embodiment determines a UE to operate as a relay UE will be described below with reference to FIGS.
  • UE 100-1 to UE 100-3 are in the second environment (UE 100-2 is located in a cell managed by eNB 200).
  • the eNB 200 notifies the UE 100-2 of a threshold (Threshold) for comparison with the measured value of the signal from the eNB 200.
  • the threshold may be, for example, a threshold of a reception level (RSRP: Reference Signal Received Power and / or RSRQ: Reference Signal Received Quality).
  • the UE 100-2 may be a UE selected by the eNB 200 as a UE to be a candidate for a remote UE.
  • step S712 the UE 100-2 compares the measured value of the signal from the eNB 200 with the threshold value received from the eNB 200 in step S711. The UE 100-2 determines whether or not the measurement value is below the threshold value.
  • the UE 100-2 When the measured value falls below the threshold (YES in S712), the UE 100-2 requests relay control from the eNB 200 in Step S713.
  • the UE 100-2 continues measuring the signal from the eNB 200 again.
  • step S714 the eNB 200 transmits a side link synchronization signal (SideLink Synchronization Signal: SLSS) and / or a discovery signal (Discovery Signal) in response to a relay control request from the UE 100-2.
  • SLSS Side Link Synchronization Signal
  • Discovery Signal Discovery Signal
  • step S715 the UE 100-1 and the UE 100-3 broadcast a side link synchronization signal and / or a discovery signal in response to a request from the eNB 200.
  • the UE 100-2 measures the side link synchronization signal and / or the discovery signal broadcast from the UE 100-1 and the UE 100-3.
  • the measurement is, for example, measurement of a reception level (RSRP and / or RSRQ).
  • step S717 the UE 100-2 reports the measurement result (measurement report) measured in step S16 to the eNB 200.
  • the eNB 200 determines the relay UE as the UE 100-1 based on the measurement report received from the UE 100-2. For example, the eNB 200 compares the measurement value of the signal from the UE 100-1 and the measurement value of the signal from the UE 100-3 included in the measurement report received from the UE 100-2. The eNB 200 may determine the UE 100-1 as the relay UE because the measured value of the signal from the UE 100-1 is higher. Moreover, eNB200 may determine UE which becomes relay UE based on the measurement result of UE100-1 and UE100-3 of the signal transmitted from eNB200.
  • eNB200 may determine UE which becomes relay UE based on the number of UE which exists in the vicinity of UE100-1 and UE100-3, respectively among UE selected as a candidate of remote UE. Also, the eNB 200 selects a UE to be a relay UE based on the transmittable range (Range) of the UE 100-1 and the UE 100-3 specified based on the reception result of the discovery signal transmitted by the UE 100-1 and the UE 100-3. You may decide. Moreover, eNB200 may determine UE which becomes relay UE according to the traffic amount of remote UE.
  • step S719 the eNB 200 transmits an RRC Connection Reconfiguration message to the UE 100-1 determined as the relay UE.
  • the RRC Connection Reconfiguration message includes setting information for operating as a relay UE.
  • the content of the RRC Connection Reconfiguration message may be the same as in the fourth embodiment.
  • UE 100-1 to UE 100-3 are in the second environment (UE 100-2 is located in a cell managed by eNB 200).
  • Step S721 is the same as step S711 in FIG.
  • step S722 the eNB 200 selects the UE 100-1 and the UE 100-3 as relay UE candidates.
  • step S723 the eNB 200 transmits settings for transmitting a side link synchronization signal and / or a discovery signal to the UE 100-1 and the UE 100-3 selected in step S722.
  • step S724 the UE 100-1 and the UE 100-3 start broadcasting side link synchronization signals and / or discovery signals based on the settings transmitted from the eNB 200.
  • step S725 the UE 100-2 compares the measured value of the signal transmitted from the eNB 200 with the threshold value received from the eNB 200 in step S721. The UE 100-2 determines whether or not the measurement value is below the threshold value.
  • the UE 100-2 determines that the measurement value is lower than the threshold (YES in S725), the UE 100-2 measures the side link synchronization signal and / or discovery signal broadcast from the UE 100-1 and UE 100-3 in step S726. .
  • the UE 100-2 determines that the measurement value does not fall below the threshold value (S725: NO), the UE 100-2 continues measurement of the signal from the eNB 200.
  • step S727 the UE 100-2 reports the measurement result (measurement report) measured in step S726 to the eNB 200.
  • Steps S728 and S729 are the same as steps S718 and 719 shown in FIG.
  • the UE 100-1 to the UE 100-3 may be any UE in the first environment or the second environment.
  • Steps S731 to S733 are the same as steps S722 to S724 in FIG.
  • the UE 100-2 measures the side link synchronization signal and / or the discovery signal broadcast from the UE 100-1 and the UE 100-3.
  • the measurement is, for example, measurement of a reception level (RSRP and / or RSRQ).
  • step S735 the UE 100-2 determines whether or not the measurement value in step S734 exceeds a threshold value.
  • the threshold is set based on information stored in advance in the SIM (U-SIM: Universal-Subscriber Identity Module Card) of the UE 100-2.
  • step S735 If the UE 100-2 determines in step S735 that the measured value of the side link synchronization signal and / or discovery signal received from the UE 100-1 has exceeded the threshold (YES in step S735), the UE 100-2 notifies the UE 100-1 in step S736. The relay control is requested.
  • the UE 100-2 determines that the measured values of the side link synchronization signal and / or the discovery signal received from the UE 100-1 and the UE 100-3 do not exceed the threshold (NO in step S735), the UE 100- 1 and the measurement of the side link synchronization signal and / or discovery signal received from the UE 100-3 are continued.
  • step S737 when receiving a request for relay control from the UE 100-2, the UE 100-1 transfers the request to the eNB 200.
  • step S738 when the eNB 200 receives the relay control request from the UE 100-2 transferred from the UE 100-1, the eNB 200 determines the relay UE as the UE 100-1.
  • Step S739 is the same as step S719.
  • the UE 100-1 to the UE 100-3 are in the second environment (the UE 100-2 is located in a cell managed by the eNB 200).
  • Steps S741 to S743 are the same as steps S711 to 713 in FIG.
  • step S744 the eNB 200 requests the UE 100-2 to transmit a side link synchronization signal (SideLink Synchronization Signal: SLSS) and / or a discovery signal (Discovery Signal) in response to a relay control request from the UE 100-2.
  • SLSS Side Link Synchronization Signal
  • Discovery Signal Discovery Signal
  • step S745 the UE 100-2 broadcasts a side link synchronization signal and / or a discovery signal in response to a request from the eNB 200.
  • the UE 100-1 and the UE 100-3 measure the side link synchronization signal and / or the discovery signal broadcast from the UE 100-2.
  • the measurement is, for example, measurement of a reception level (RSRP and / or RSRQ).
  • step S747 the UE 100-1 and the UE 100-3 report (measurement report) the measurement result measured in step S746 to the eNB 200.
  • the eNB 200 determines the relay UE as the UE 100-1 based on the measurement reports received from the UE 100-1 and the UE 100-3. For example, the eNB 200 compares the measurement value of the signal from the UE 100-2 included in the measurement report received from the UE 100-1 with the measurement value of the signal from the UE 100-2 included in the measurement report received from the UE 100-3.
  • the UE 100-1 may be determined as the relay UE because the measurement value of the signal from the UE 100-2 included in the measurement report received from the UE 100-1 is higher.
  • Step S749 is the same as step S719 shown in FIG.
  • the UE 100-1 to the UE 100-3 are in the second environment (the UE 100-2 is located in a cell managed by the eNB 200).
  • the eNB 200 determines the UE 100-2 as a remote UE. For example, the eNB 200 receives a measurement report including a measurement result of a signal from the eNB 200 from the UE 100-2. The eNB 200 may determine the UE 100-2 as a remote UE when the measurement result is lower (bad) than a predetermined value.
  • step S752 the eNB 200 transmits setting information related to the side link synchronization signal and / or the discovery signal to the UE 100-2.
  • step S753 the UE 100-2 applies the setting information received from the eNB 200 and broadcasts a side link synchronization signal and / or a discovery signal.
  • Steps S754 to S757 are the same as steps S746 to 749.
  • the UE 100-1 to UE 100-3 may be any UE in the first environment or the second environment.
  • step S761 the UE 100-2 compares the measured value of the signal from the eNB 200 with the threshold value received from the eNB 200 in advance. The UE 100-2 determines whether or not the measurement value is below the threshold value.
  • the UE 100-2 determines that the measured value is lower than the threshold value (YES in S761), the UE 100-2 notifies the side link synchronization signal and / or the discovery signal in step S713.
  • the UE 100-2 determines that the measured value does not fall below the threshold (NO in S761), the UE 100-2 continues measuring the signal from the eNB 200 again.
  • Steps S762 to S766 are the same as steps S745 to S749.
  • the eNB 200 can select a suitable UE as a remote UE among a plurality of UEs as a remote UE, and execute relay control.
  • An additional example of the sixth embodiment relates to an operation for determining whether or not the UE 100-1 becomes a remote UE when the eNB 200 determines the UE 100-1 as a remote UE in the sixth embodiment.
  • Steps S771 and S772 are steps S718 and S719 in FIG. 34, steps S728 and S729 in FIG. 35, steps S738 and S739 in FIG. 36, steps S748 and S749 in FIG. 37, steps S756 and S757 in FIG. This corresponds to S765 and S766.
  • step S773 the UE 100-1 determines whether or not to operate as a relay UE (in other words, whether or not to apply the setting included in the RRC Connection Reconfiguration message received in step S772).
  • step S774 UE 100-1 transmits to eNB 200 the result determined in step S773 (or whether setting based on the RRC Connection Reconfiguration message is completed based on the determined result).
  • Step S781 is the same as step S471.
  • step S782 the eNB 200 transmits information indicating that the UE 100-1 is a relay UE (Relay UE indication).
  • step S783 when the UE 100-1 receives the Relay UE indication, the UE 100-1 determines whether or not to operate as a relay UE, as in step S773.
  • step S784 the UE 100-1 transmits the result determined in step S783 to the eNB 200.
  • step S785 the eNB 200 determines whether or not the determination result of the UE 100-1 received in step S784 operates as a relay UE (OK).
  • Step S785 If the determination result of the UE 100-1 operates as a relay UE (OK) (YES in Step S785), the eNB 200 transmits an RRC Connection Reconfiguration message to the UE 100-1 in Step S786, similarly to Step S772.
  • the eNB 200 does not transmit (restricts transmission) the RRC Connection Reconfiguration message to the UE 100-1.
  • FIG. 42 is a diagram for explaining a delay from when data is generated until it is transmitted.
  • FIG. 43 is a sequence diagram for explaining an operation according to the seventh embodiment.
  • a radio resource pool in which a control region (PSCCH) and a data region (PSSCH) are alternately arranged in the time direction is used for direct communication.
  • the radio resource pool used for direct communication is repeatedly arranged in a predetermined period (SC period: SC Period) in the time direction.
  • SC period SC Period
  • the radio resource pool used for direct communication depends on the control area (physical side link control channel (PSCCH)) and data area (physical side link shared channel (PSSCH)).
  • PSCCH physical side link control channel
  • PSSCH physical side link shared channel
  • a plurality of radio resource pools composed of a control area and a data area are arranged in the time direction.
  • the length of one radio resource pool in the time direction coincides with an SC period (SC Period) that is a cycle of the radio resource pool.
  • SC Period SC period
  • the control area and the data area are alternately arranged in the time direction. Therefore, the control areas are arranged at intervals in the time direction.
  • the data area follows the control area in the time direction
  • the control area is an area where a PSCCH for transmitting side link control information (SCI: Sidelink Control Information) by direct communication is arranged. Therefore, the control area corresponds to a control resource pool in which radio resources (hereinafter referred to as control resources) for transmitting SCI by direct communication are arranged.
  • the SCI is information for notifying a radio resource (hereinafter referred to as data resource) allocated to transmit data by direct communication. Specifically, the SCI includes data resource allocation information.
  • the data area is an area where a PSSCH for transmitting data is arranged. Therefore, the data area corresponds to a data resource pool in which radio resources for transmitting data by direct communication are arranged.
  • the control area corresponds to the above-described SC pool.
  • the data area corresponds to the data pool described above.
  • the UE 100 waits until the next control region following the data region is reached. Using the radio resource in the next control area, the UE 100 transmits an SCI for notifying the radio resource in the subsequent data area to other UEs. Then, UE100 transmits the data which should be transmitted to other UE using the radio
  • the above-described predetermined delay may exceed the allowable delay required for the high priority packet.
  • the UE 100 may not be able to transmit a high priority packet within the allowable delay range. Therefore, a technique for enabling appropriate data transmission by direct communication when high priority data is generated will be described.
  • the UE 100-1 transmits the SCI to the UE 100-2 by direct communication within the control area.
  • SCI is information for notifying radio resources allocated for transmitting data by direct communication.
  • the SCI includes radio resource allocation information indicating a plurality of radio resources arranged separately in the time direction in the data area.
  • the SCI includes a destination identifier addressed to the UE 100-2.
  • the UE 100-2 that has received the SCI knows the radio resource to which data is transmitted based on the SCI (assignment information).
  • the UE 100-1 transmits a normal packet (normal priority packet) using the radio resource indicated by the allocation information (first radio resource including a plurality of resources for repeated transmission).
  • the normal packet has a lower priority (for example, normal priority) than the high priority packet.
  • the UE 100-2 receives data based on the allocation information.
  • the UE 100-2 repeatedly transmits a normal packet four times.
  • the UE 100-2 combines the packets received four times to obtain a normal packet.
  • step S803 high priority data (high priority packet) having a higher priority than the data scheduled to be transmitted (untransmitted normal packet) is generated in the UE 100-1.
  • step S804 the UE 100-1 transmits a high priority packet (High priority packet) prior to the normal packet using the radio resource (second radio resource) indicated by the allocation information. That is, the UE 100-1 interrupts the high-priority packet in the data being transmitted and preferentially transmits the high-priority packet. As described above, the UE 100-1 uses the radio resource allocated for the normal packet scheduled to be transmitted to transmit the high priority packet.
  • the UE 100-1 starts transmitting the high priority packet after the retransmission of the normal packet is completed.
  • the UE 100-2 can appropriately receive (acquire) the normal packet and the high priority packet without combining the normal packet and the high priority packet.
  • the UE 100-1 may transmit information indicating that the packet (data) transmitted using the second radio resource is not a normal packet (data) to be transmitted but a high priority packet (data). Good. For example, the UE 100-1 can transmit bit information indicating the high priority packet together with the high priority packet. The UE 100-1 may transmit information indicating a high priority packet separately from the high priority packet. The UE 100-1 may transmit information indicating that the packet is a high priority packet before or after the high priority packet.
  • the UE 100-1 When the priority is associated with the logical channel, the UE 100-1 can be regarded as associated with the logical channel identifier (LCID). Therefore, the UE 100-1 can transmit a high priority packet using an LCID having a higher priority than the LCID for the normal packet scheduled to be transmitted. That is, the UE 100-1 can transmit a high priority packet including an LCID corresponding to a logical channel having a higher priority than the logical channel used for transmitting the normal packet. The UE 100-1 can transmit a high priority packet using the logical channel having a high priority.
  • LCID logical channel identifier
  • the information regarding the priority of a logical channel (group) and LCID may be notified to each UE100 by transmission (unicast or broadcast) from eNB200.
  • Each UE 100 may have information on the priority by pre-configured.
  • the UE 100-1 may execute the above operation using the logical channel group identifier (LCG ID: Logical Channel Group ID).
  • the UE 100-2 receives the high priority packet transmitted using the second radio resource based on the allocation information.
  • the UE 100-2 receives information indicating that the packet transmitted using the second radio resource is not a normal packet scheduled to be transmitted but a high priority packet, the received packet is a high priority packet. May be judged.
  • the UE 100-2 may determine that the received packet is a high priority packet based on the LCID. Specifically, the UE 100-2 determines that the packet received in step S803 has a high priority by receiving an LCID having a higher priority than the LCID included in the packets received so far. Also good.
  • the UE 100-2 may determine that the packet received in step S803 is a high priority packet when the content of the packet received in step S803 is not related to the packet received so far.
  • step S805 the UE 100-1 resumes normal packet transmission.
  • the UE 100-1 transmits all the high priority packets, the UE 100-1 resumes transmission of the normal packets.
  • the UE 100-1 may transmit information indicating that it is a normal packet, as described above.
  • the UE 100-1 may transmit a normal packet using an LCID with a low priority.
  • the UE 100-2 receives the normal packet.
  • the UE 100-1 may determine that the received packet is a normal packet based on information indicating that the packet is a normal packet and / or LCID having a low priority.
  • the UE 100-1 may transmit a new SCI using radio resources in the next control area and transmit an untransmitted normal packet. it can.
  • the UE 100-1 can transmit the high priority packet before transmitting the control information in the next control area even when the high priority packet is generated after notifying the SCI. For this reason, since the UE 100-1 can transmit a high priority packet within an allowable delay, it is possible to transmit data appropriately by direct communication.
  • FIG. 44 is a sequence diagram for explaining an operation according to the first modification of the seventh embodiment.
  • the communication partner of the UE 100-1 is only the UE 100-2, and the transmission destinations of the normal packet and the high priority packet are the same.
  • this modified example a case where the transmission destinations of the normal packet and the high priority packet are different will be described. Note that a description of the same parts as at least one of the above-described embodiments is omitted.
  • step S901 the UE 100-1 generates a packet (normal packet) to be transmitted to the UE 100-2.
  • UE 100-1 has UE 100-2 and UE 100-3 as communication partners, but no packet to be transmitted to UE 100-3 has occurred. Thus, even when there are a plurality of communication partners, packets to be transmitted to all communication partners are not necessarily generated.
  • the UE 100-1 transmits the SCI.
  • the UE 100-1 includes in the SCI the destination identifier of the UE 100-3 that is a candidate terminal that can be the transmission destination of the high priority packet, in addition to the destination identifier of the UE 100-2 that is the transmission destination of the packet to be transmitted.
  • the UE 100-1 estimates a candidate terminal that can be a transmission destination of the high priority packet. For example, the UE 100-1 may estimate a public safety UE (ProSe-enabled Public Safety UE) as a candidate terminal. The UE 100-1 may estimate the candidate terminal before transmitting each SCI. The UE 100-1 may estimate the candidate terminal only before transmitting the SCI for the first time. When the UE 100-1 subsequently transmits the SCI, the UE 100-1 may omit the estimation of the candidate terminal and include the destination identifier of the candidate terminal estimated in the past in the SCI.
  • a public safety UE ProSe-enabled Public Safety UE
  • the UE 100-1 may estimate a candidate terminal that can be a transmission destination of the high priority packet based on an identifier (destination identifier) of the transmission destination. For example, when receiving a high priority packet in the past, the UE 100-1 may estimate the UE indicated by the identifier of the transmission source of the high priority packet as a candidate terminal. When the transmission destination of the generated high priority packet is determined, the UE 100-1 may use the transmission destination as a candidate terminal. The UE 100-1 may determine an important UE (for example, a UE used in the operation headquarters) as a candidate terminal. The UE 100-1 may determine an important UE (that is, a candidate terminal) based on application level (ProSe Function) information.
  • application level ProSe Function
  • the UE 100-1 selects a UE that is not a destination of a packet for a predetermined time (that is, the UE when a predetermined time has elapsed since the transmission of a packet addressed to the UE) as a candidate terminal. May be estimated.
  • the UE 100-1 may estimate the UE that was the destination of the packet within the predetermined time (that is, the UE when the predetermined time has not elapsed since the packet addressed to the UE has been transmitted) as the candidate terminal. .
  • the UE 100-1 may start a timer for measuring a predetermined time when a packet is transmitted.
  • the UE 100-1 estimates a UE that is a transmission source of a packet that is a trigger for starting the timer as a candidate terminal.
  • the UE 100-1 that performs direct communication with a plurality of UEs may start and stop a timer for measuring a predetermined time for each destination UE.
  • the UE 100-1 may estimate the UE corresponding to the expired timer as a candidate terminal. Note that the UE 100-1 may reset (or stop) the timer corresponding to the UE that has already finished the direct communication.
  • the UE 100-1 includes the destination identifier of the candidate terminal (UE 100-3) in the SCI even when the candidate terminal is not the transmission destination of the packet to be transmitted. Therefore, the UE 100-1 includes the destination identifier of the candidate terminal in the SCI even though no high priority packet has occurred.
  • the UE 100-1 may clarify the destination identifier of the candidate terminal by storing the destination identifier of the candidate terminal in a field different from the destination identifier for the normal packet. Note that the UE 100-1 can notify a plurality of destination identifiers with one SCI, as described in the second embodiment.
  • the UE 100-3 monitors the radio resource (PSSCH) indicated by the allocation information included in the SCI because its own destination identifier is included in the SCI.
  • PSSCH radio resource
  • the UE 100-1 transmits a normal packet as in step S802.
  • the UE 100-2 receives the normal packet.
  • the UE 100-3 receives the normal packet because the SCI includes the destination identifier of the UE 100-3. For example, when the destination identifier included in the received packet (header) does not indicate the UE 100-3, the UE 100-3 can discard the received packet.
  • the UE 100-3 may execute the same operation as “(H) reception of data” in the second embodiment described above.
  • step S904 a high priority packet is generated in the UE 100-1.
  • the high priority packet is a packet addressed to the UE 100-3.
  • the UE 100-1 transmits a high priority packet as in step S803.
  • the UE 100-1 includes the destination identifier of the UE 100-3 in the high priority packet (MAC subheader thereof). Since the destination identifier included in the received packet (high priority packet) does not indicate the UE 100-2, the UE 100-2 discards the received packet. Since the destination identifier included in the received packet (high priority packet) indicates the UE 100-2, the UE 100-3 decodes the received packet without discarding it. As a result, the UE 100-3 can receive the high priority packet within the SC period in which the high priority packet has occurred.
  • Step S906 corresponds to step S805.
  • the UE 100-1 can transmit the high priority packet within the allowable delay even when the transmission destination of the generated high priority packet is different from the transmission destination of the normal packet.
  • Modification 2 of 7th Embodiment Next, Modification 2 of the seventh embodiment will be described.
  • the UE 100-3 that is the candidate terminal is indicated by the radio resource (PDSCH) indicated by the allocation information I was monitoring.
  • the candidate terminal monitors the radio resource indicated by the allocation information even when the control information does not include the candidate terminal destination identifier.
  • the UE 100-1 estimates a candidate terminal that can be a transmission destination of the high priority packet.
  • the UE 100-1 associates the resource pool used for transmitting the high priority data with the destination identifier of the candidate terminal. If the transmission resource pool to be used for direct communication is already determined, the UE 100-1 associates the transmission resource pool with the destination identifier of the candidate terminal.
  • the UE 100-1 notifies the candidate terminal of the associated resource pool and the destination identifier of the candidate terminal. For example, the UE 100-1 can notify the candidate terminal of a list of destination identifiers (destination ID List) of the candidate terminals associated with the resource pool. The UE 100-1 can notify the list and the associated resource pool (hereinafter referred to as priority information) before performing direct communication or during direct communication. The UE 100-1 can notify the priority information to the candidate terminal by the following method.
  • the UE 100-1 notifies the priority information to the candidate terminal via the eNB 200.
  • the UE 100-1 transmits the priority information to the eNB 200 by using, for example, a SLUEInformation message.
  • the eNB 200 notifies priority information (or priority information corresponding to each UE) to each UE 100 corresponding to the destination identifier included in the received priority information.
  • the eNB 200 notifies the priority information for each UE by an RRC reconfiguration message.
  • eNB200 may alert
  • SIB System Information Block
  • the UE 100-1 may notify the candidate terminal of priority information by direct discovery (direct discovery procedure) in the proximity service.
  • the priority information may include not only a list of candidate terminal destination identifiers and associated resource pools but also information indicating resource pool priorities (eg, Highn / Middle / Low).
  • the priority of the resource pool indicates the priority with respect to other receptions (for example, reception on different carriers, different resource pools).
  • the UE 100-2 can perform reception in consideration of the priority of the resource pool according to the number of receivers (RxChanin). Further, the UE 100-2 may monitor a resource pool having a high priority and omit monitoring a resource pool having a low priority in order to reduce reception processing power.
  • the UE 100-3 When the priority information includes its own destination identifier, the UE 100-3 that is a candidate terminal monitors the resource pool associated with its own destination identifier. When the SCI from the UE 100-1 is included in the control area in the resource pool, the UE 100-3 uses the packet based on the allocation information included in the SCI even if the destination identifier is not included in the SCI. Receive.
  • the UE 100-1 notifies the candidate terminal in advance of the destination identifier of the candidate terminal and the associated resource pool regardless of the occurrence of the high priority packet. Thereby, even when the UE 100-1 does not include the destination identifier of the candidate terminal in the control information, the UE 100-3 can acquire the high priority packet.
  • Modification 3 of 7th Embodiment Next, Modification 3 of the seventh embodiment will be described.
  • the destination identifier of the transmission destination of the high priority packet is included in the data (MAC subheader).
  • the UE 100-1 that transmits a packet indicates that data of a plurality of destinations is included in the packet (data) as in the second embodiment described above so that a plurality of UEs including candidate terminals monitor data resources.
  • An SCI including a destination identifier (special destination identifier) or a plurality of destination identifiers is generated.
  • the UE 100-2 that has received the SCI monitors radio resources in the data area.
  • the UE 100-1 stores a destination identifier of the destination of the high-priority packet in the MAC subheader of the high-priority packet (MAC PDU).
  • the UE 100-2 can discard the received packet.
  • UE100 which is not the transmission destination of a high priority packet can abbreviate
  • the UE 100-2 may execute the same operation as “(H) reception of data” in the second embodiment.
  • Modification 4 of 7th Embodiment Next, Modification 4 of the seventh embodiment will be described.
  • the seventh embodiment the case where a high priority packet occurs has been described.
  • a case where a plurality of different data (packets) occurs at the same timing will be described.
  • UE 100-1 When UE 100-1 generates a plurality of data having the same priority at the same timing, UE 100-1 associates each of the plurality of data with an LCID. Using the associated LCID, the corresponding data (packet) is transmitted. The UE 100-2 that receives the packet can distinguish the packet by the LCID. The UE 100-2 can appropriately acquire a plurality of data by processing each packet corresponding to the LCID.
  • the UE 100-1 can transmit one SCI including one destination identifier.
  • the UE 100-1 can repeatedly transmit one MAC PDU four times in the PHY layer.
  • the UE 100-1 may preferentially transmit any one of a plurality of data.
  • the UE 100-1 When UE 100-1 generates a plurality of data at the same timing, as in the first embodiment or the second embodiment described above, the UE 100-1 is within one control area (SC pool). A plurality of SCIs may be notified, or a plurality of destinations may be notified by one SCI.
  • SC pool control area
  • the UE 100-1 when the UE 100-1 transmits a plurality of data having different destinations, transmission of data (second data) transmitted after the first data (first data) may be restricted. Therefore, the UE 100-1 may be limited so that it is difficult to transmit the second data. For example, by reducing at least one of the probability that the second data itself can be transmitted (txProbability), the probability that it can be repeatedly transmitted (repeat), the selection probability of the control resource in the PSCCH, and the number of data resources that the UE can select, The UE 100-1 becomes difficult to transmit the second data. Note that, in the case of transmitting a plurality of data within the same SC period, the UE 100-1 is restricted from transmitting the second data. The UE 100-1 can transmit the second data without limitation when transmitting the first data in the first SC period and transmitting the second data in the second SC period.
  • resources that can be used by the UE 100-1 may be limited regardless of priority.
  • the UE 100 is limited by limiting the resource block usage amount of the control resource, the number of transmission control information (number of SCIs), the transmission control probability (txProbability), the resource block usage amount of the data resource, the transmission data probability (txProbability), and the like.
  • Resources that can use -1 may be limited. These resource restrictions may be notified from the eNB 200 by SIB, may be individually set from the eNB 200, or may be set in advance in the UE 100-1.
  • the UE 100-1 may transmit the second data without restriction. Therefore, the UE 100-1 can transmit the second data in the same manner as the first data.
  • FIG. 45 is a diagram for explaining the operating environment according to the eighth embodiment.
  • UE 100 (UE 100-1 and UE 100-2) is located in a cell managed by eNB 200.
  • the UE 100 can execute cellular communication (LTE-Uu) with the eNB 200.
  • UE 100 is in an RRC connected state.
  • the UE 100 may be in an RRC idle state.
  • the UE 100 may transition from the RRC idle state to the RRC connected state.
  • UE 100-1 and UE 100-2 are in a state in which direct communication is being executed or in a state before starting execution of direct communication.
  • the UE 100-1 and the UE 100-2 can perform direct communication using the resource pool shown in FIG. Specifically, UE 100-1 transmits data (packet) to UE 100-2 by direct communication.
  • FIG. 46 is a sequence diagram for explaining the operation according to the embodiment.
  • FIG. 47 is a diagram for explaining the operation according to the embodiment.
  • the eNB 200 sets a resource pool for direct communication with the UE 100-1 and the UE 100-2 located in the cell.
  • the eNB 200 provides a plurality of resource pools (resource pool A and resource pool B) in the same carrier (see FIG. 47). Note that the frequency at which the resource pool A and the resource pool B are arranged is different.
  • the SC cycle of resource pool B is shorter than the SC cycle of resource pool A.
  • ENB 200 allocates radio resources in the resource pool set in UE 100-1 and UE 100-2 to UE 100-1 and UE 100-2.
  • the eNB 200 does not set the data resource pool in the UE 100-1 and the UE 100-2 when allocating the data resource to the UE 100-1 and the UE 100-2.
  • the UE 100-1 and the UE 100-2 may autonomously select a radio resource from the set resource pool without being assigned a radio resource from the eNB 200. Note that when the UE 100-1 and the UE 100-2 are located outside the cell, the UE 100-1 and the UE 100-2 perform direct communication using a preset resource pool.
  • the UE 100-1 and UE 100-2 are in a state in which direct communication is being executed or in a state before starting execution of direct communication.
  • the UE 100-1 transmits data (packets) to the UE 100-2 using the control resource and the data resource in the resource pool A.
  • the eNB 200 transmits the first priority information related to the association between the resource pool used for direct communication and the priority to the UE 100 (UE 100-1 and UE 100-2).
  • the UE 100 receives the first priority information.
  • the eNB 200 may transmit the first priority information to the UE 100 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). Note that the UE 100 located outside the cell coverage may have the first priority information set in advance.
  • the first priority information is information in which a resource pool for direct communication and a priority are associated with each other.
  • resource pool A and priority 0 for example, Low priority
  • resource pool B and priority 1 for example, High priority
  • the eNB 200 may transmit, to the UE 100, information on an essential resource pool that is essential to be monitored among resource pools for direct communication.
  • eNB200 may transmit the information regarding an essential resource pool to UE100 with 1st priority information.
  • the information regarding the essential resource pool is flag information (true / false) associated with each resource pool.
  • “true” indicates that monitoring is essential.
  • “False” indicates that monitoring is not essential.
  • “false” is associated with the resource pool A, and “true” is associated with the resource pool B.
  • the UE 100 monitors the essential resource pool. Specifically, the UE 100 performs a reception attempt for receiving the SCI in the control area in the essential resource pool.
  • the UE 100 monitors the data area and receives data based on radio resource allocation information (data resource) in SCI. The UE 100 does not monitor the data area when the SCI is not included in the control area.
  • the eNB 200 transmits identification information related to the logical channel (for example, logical channel group identifier (LCG ID)) and second priority information related to the priority to the UE 100 (UE 100-1 and UE 100-2).
  • the UE 100 receives the second priority information.
  • the eNB 200 may transmit the second priority information to the UE 100 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). Note that the second priority information may be set in advance for the UE 100 located outside the cell coverage.
  • the second priority information is information in which identification information related to the logical channel (for example, logical channel group identifier (LCG ID)) and the priority are associated with each other.
  • LCG ID # 1 and priority 0 for example, Low priority
  • LCG ID # 2 and priority 1 for example, High priority
  • the identification information regarding the logical channel may be a logical channel identifier (LCID). Therefore, LCID and priority may be associated.
  • the eNB 200 may notify the UE 100-1 of an LCG ID (or LCID) having a higher priority than a normal LCG ID (or LCID) as information on the priority. For example, in the priority list, an LCG ID (or LCID) with a low priority is not described, and an LCG ID (or LCID) with a high priority may be described. Therefore, the UE 100-1 may determine that an LCG ID (or LCID) not listed in the priority list has a normal priority.
  • eNB200 may transmit 1st priority information and 2nd priority information to UE100 simultaneously.
  • high priority data (hereinafter, high priority data) is generated in the UE 100-1.
  • the high priority data may not be data having a high priority.
  • the high priority data may be data (Middle priority) having a higher priority than data (for example, Low priority) transmitted by the UE 100-1 using the control resource in the control resource pool.
  • the UE 100-1 selects the resource pool B having a shorter cycle than the resource pool A, not the resource pool A used for transmitting normal data having a lower priority than the high priority data. That is, the UE 100-1 selects the resource pool B that is repeatedly arranged at a cycle shorter than the SC period of the resource pool A. The UE 100-1 may select a resource pool for transmitting high priority data based on the SC cycle of the resource pool.
  • the UE 100-1 may select the resource pool B as a resource pool for transmitting high priority data based on the first priority information.
  • the UE 100-1 may select a resource pool B having a higher priority than the resource pool A as a resource pool for transmitting high priority data. Note that the UE 100-1 cannot select a resource pool B with a high priority when transmitting normal data with a low priority.
  • the resource pool B is a resource pool dedicated to high priority data for transmitting high priority data.
  • the UE 100-1 may select the resource pool B as a resource pool for transmitting high priority data based on information on the essential resource pool. For example, when the resource pool C having the same priority as the resource pool B and having no essential resource pool is set, the UE 100-1 may select the resource pool B instead of the resource pool C. .
  • the UE 100-1 selects a control resource that can be selected after high priority data is generated in the resource pool B.
  • the UE 100-1 selects a control resource and a data resource that can transmit the high priority data earliest. Specifically, in FIG. 10, UE 100-1 selects a control resource in the control resource pool in SC period # B2. Further, UE 100-1 selects a data resource in the data resource pool in SC period # B2.
  • the eNB 200 may select the resource pool B and radio resources (control resources and / or data resources) for high priority data.
  • the eNB 200 can select the resource pool B and the radio resource similarly to the UE 100-1.
  • the eNB 200 transmits control information (DCI) for notifying the selected resource pool and radio resource to the UE 100-1.
  • DCI control information
  • step S1040 the UE 100-1 transmits an SCI for notifying a data resource for transmitting high priority data to the UE 100-2.
  • the UE 100-1 transmits the SCI using the selected control resource in the resource pool B.
  • the SCI includes allocation information of data resources in the resource pool B.
  • the UE 100-2 constantly monitors the resource pool B (internal control resource pool) having a high priority.
  • the UE 100-2 may always monitor the resource pool B when the resource pool B is an essential resource pool based on information on the essential resource pool from the eNB 200.
  • the UE 100-2 monitoring the control resource pool receives the SCI from the UE 100-1 using the control resource in the resource pool B. Based on the received SCI, the UE 100-2 grasps a data resource to which data (high priority data) is transmitted.
  • step S1050 the UE 100-1 transmits high priority data to the UE 100-2 using the data resource notified by the SCI.
  • the UE 100-1 transmits normal data having a lower priority than the high priority data by direct communication
  • the UE 100-1 transmits the high priority data with priority over the normal data.
  • the UE 100-1 may interrupt the transmission of the normal data at a time when the cut is good and start the transmission of the high priority data. For example, if retransmission of a packet corresponding to normal data corresponding to normal data (repeated transmission four times) has not been completed, UE 100-1 may start transmission of high-priority data after completion of packet retransmission .
  • the UE 100-1 may immediately stop transmission of normal data and start transmission of high priority data. For example, the UE 100-1 may prioritize transmission of high priority data over packet retransmission. Therefore, the UE 100-1 may start transmitting high-priority data even when retransmission of the normal data packet is not completed. In this case, the UE 100-1 may notify the UE 100-2 that transmission of normal data has been interrupted. As a result, the UE 100-2 retains the normal data received halfway without discarding it. If the UE 100-2 does not receive from the UE 100-1 that the transmission of normal data has been interrupted, the UE 100-2 may discard the normal data received halfway. When retransmission has not been completed, UE 100-1 may start retransmission after transmission of high priority data is completed. If the UE 100-1 does not notify the UE 100-2 that transmission of normal data has been interrupted, the UE 100-1 may transmit a packet for which retransmission has not been completed as a new packet.
  • the UE 100-1 may notify the UE 100-2 of a timing (Resume Timing) and / or a period (Resume Period) at which transmission of the interrupted normal data is resumed.
  • Resume Timing is information for specifying a PSCCH time resource when resuming transmission of normal data within an SC period in which transmission of normal data is interrupted.
  • Resume Period is information for designating a period in a case where transmission of normal data is resumed after an SC period in which transmission of normal data is interrupted.
  • the UE 100-2 resumes reception of normal data based on Resume Timing and / or Resume Period.
  • the UE 100-1 may determine whether to retransmit the normal data packet before transmitting the high priority data based on the instruction from the eNB 200.
  • the eNB 200 may include interruption flag information (Interrupt flag) in DCI including radio resource allocation information.
  • interruption flag information indicates “True”
  • the UE 100-1 transmits the high priority data even if the retransmission of the packet is not completed.
  • the interruption flag information indicates “False”
  • the UE 100-1 transmits the high priority data after the retransmission of the packet is completed.
  • DCI may include Resume Timing and / or Resume Period information.
  • the UE 100-1 transmits the untransmitted packet using the data resource in the resource pool A, and the data resource in the resource pool B. High priority data may be transmitted using.
  • the UE 100-1 transmits high priority data using the data resource in the resource pool B whose SC period is shorter than that of the resource pool A.
  • the UE 100-1 transmits the high priority data using the radio resource in the resource pool corresponding to the SC period. Therefore, when the high priority data occurs, the UE 100-1 can transmit the high priority data within the SC period in which the high priority data has occurred. Thereby, UE100-1 can transmit data appropriately by direct communication.
  • FIG. 48 is a diagram for explaining a modified example of the eighth embodiment. Note that description of parts similar to those of the first embodiment is omitted as appropriate.
  • the UE 100-2 always monitors the resource pool B that has a high priority level or that needs to be monitored. However, there is a problem that the monitoring load of the UE 100-2 increases. Therefore, the UE 100-2 does not always have to be monitored by the following method.
  • the eNB 200 determines a resource pool to be monitored (actually) among the resource pool B by the UE 100-2. That is, the eNB 200 determines the monitoring frequency.
  • the eNB 200 may set the monitoring frequency for each UE by unicast (for example, RRC reconfiguration message).
  • the eNB 200 may notify the monitoring frequency to UEs under its control by broadcast (for example, SIB).
  • the monitoring frequency of the UE 100-2 may be set in advance.
  • the UE 100-2 may notify the eNB 200 of a preset monitoring frequency.
  • the monitoring frequency may be determined by the period of the monitoring period.
  • the UE 100-2 performs monitoring every 3 SC periods.
  • the eNB 200 can notify each related UE of the monitoring cycle by any of 1/2/3/4/8/16.
  • the monitoring frequency may be determined by a random pattern because the timing at which high priority data occurs cannot be predicted.
  • the eNB 200 can notify each associated UE of the monitoring frequency determined by the random pattern using a bitmap or a pseudo random number.
  • the UE 100-2 performs monitoring based on the bitmap of ⁇ 0, 1, 1, 0, 0, 1, 0 ⁇ . Further, the UE 100-2 may perform monitoring at a monitoring frequency determined using a pseudo random number based on the UE-specific identifier.
  • UE 100-1 receives monitoring information (ie, monitoring frequency of UE 100-2) regarding the resource pool monitored by UE 100-2 from eNB 200.
  • the UE 100-1 transmits the high priority data using the control resource and the data resource selected based on the monitor information.
  • the monitoring frequency is determined so that the time interval of the resource pool monitored by the UE 100-2 is shorter than the SC period of the resource pool A having a low priority. This can reduce the monitoring burden on the UE 100-2 while reducing the transmission delay of the high priority data.
  • FIG. 49 is a sequence diagram for explaining the operation of the ninth embodiment.
  • FIG. 49 is a diagram for explaining the operation of the ninth embodiment. Note that description of parts similar to those of the eighth embodiment is omitted as appropriate.
  • the resource pool A and the resource pool B are provided in the same carrier. In the ninth embodiment, resource pool A and resource pool B are provided in different carriers (see FIG. 50).
  • the eNB 200 transmits the third priority information related to the association between the carrier and the priority to the UE 100 (UE 100-1 and UE 100-2).
  • the UE 100 receives the third priority information.
  • the eNB 200 may transmit the third priority information to the UE 100 by broadcast (for example, SIB18) or unicast (for example, RRC reconfiguration message). Note that the UE 100 located outside the cell coverage may be preset with third priority information. Further, the UE 100 may transmit the third priority information to surrounding UEs 100 by direct discovery.
  • the third priority information is information in which a carrier and a priority are associated with each other.
  • carrier A and priority 0 for example, Low priority
  • carrier B and priority 1 for example, High priority
  • a plurality of priorities may be associated with one carrier.
  • carrier A and priority 0 are associated
  • carrier B and priorities 1, 2, and 3 are associated.
  • carrier and logical channel group identification information may be associated.
  • the identification information of the logical channel group is associated with the priority.
  • the eNB 200 notifies the UE 100 of the association between the logical channel group identification information and the priority. Thereby, UE100 can grasp
  • the eNB 200 transmits the fourth priority information related to the association between the carrier and the resource pool for direct communication to the UE 100 (UE 100-1 and UE 100-2).
  • the UE 100 receives the fourth priority information.
  • the fourth priority information may include information on the resource pool for direct communication associated with each carrier.
  • the eNB 200 may transmit the fourth priority information corresponding to the carrier for each carrier. Therefore, eNB200 transmits the 4th priority information linked
  • SIB for example, SIB18
  • the carrier, the resource pool, and the priority may be associated with each other.
  • carrier A and resource pool A and priority 0 are associated
  • carrier A and resource pool B and priority 2 are associated
  • carrier B and resource pool C and priority 1 are associated.
  • Steps S1120 to S1140 correspond to steps S1030 to S1050.
  • the UE 100-1 can select a resource pool B provided in a carrier having a higher priority than a carrier used for normal data transmission as a resource pool for transmitting high priority data.
  • the UE 100-1 may notify the eNB 200 of the number of transmission chains (Tx Chain) indicating the number of carriers that can be transmitted simultaneously. Further, the UE 100-2 may notify the eNB 200 of the number of reception chains (Rx Chain) indicating the number of simultaneously receivable carriers.
  • Each of the UE 100-1 and the UE 100-2 includes information on the number of transmission chains (for example, “commSimultaneousTx”, “comSupportPortsBands”, “comSupportedBandsPerBC”), and information on the number of reception chains (for example, “commSupportedBandscoBspBspBspBSp UE capability information including (UE Capability) may be notified to the eNB 200.
  • “comSimultaneousTx” is information indicating whether the UE is permitted to perform simultaneous transmission in the band indicated by “comSupportedBandsPerBC” (ie, the band indicated by “comSupportSupportBands” that supports simultaneous reception).
  • “CommSupportBands” is information indicating bands (frequency bands) in which the UE supports direct communication.
  • “CommSupportedBandsPerBC” is information indicating a band (frequency band) in which the UE supports simultaneous reception in direct communication and cellular communication (EUTRA).
  • the eNB 200 Based on the information notified from the UE 100, the eNB 200 sets the third priority information (association between the carrier and the priority) based on at least one of the number of transmission chains of the UE 100-1 and the number of reception chains of the UE 100-2. Can be determined.
  • the third priority information association between the carrier and the priority
  • the eNB 200 receives a reception chain for cellular communication (specifically, DL (for example, PDCCH reception)) and reception for high-priority data reception.
  • DL for example, PDCCH reception
  • One high-priority carrier may be set for the chain.
  • the eNB 200 may determine that there is a low probability that high priority data is generated at the same time, and may set two high priority carriers.
  • the UE 100-1 can transmit the high priority data using the resource pool for direct communication in one of the high priority carriers, and the UE 100-2 can monitor the UE 100-2 by monitoring both of the high priority carriers.
  • High priority data from -1 can be received.
  • the eNB 200-1 may determine the third priority information in consideration of the following.
  • reception UE When there is a condition of “cellular communication (DL)> direct communication (High Priority)> direct communication (Low Priority)”, for reception chain (High) for cellular communication (DL) and direct communication (High Priority)
  • the reception UE is required for a total of three reception chains, that is, the reception chain (Middle) of the first communication chain and the reception chain (Low) for direct communication (Low Priority).
  • the receiving UE gives up receiving direct communication (Low Priority)
  • two reception chains are necessary.
  • the receiving UE can select a desired carrier, so at least one receiving chain is required. is there.
  • a total of two receiving chains a receiving chain for direct communication (High Priority) and a receiving chain for direct communication (Low Priority), are received UE Is necessary.
  • the reception UE for the reception chain for cellular communication (DL) and the reception chain for each carrier in which a resource pool for direct communication is set is necessary. That is, the receiving UE needs a reception chain of “1 + N”.
  • the UE 100-2 may perform monitoring based on the priority associated with the carrier and the number of reception chains. For example, when the number of reception chains is one, the UE 100-2 monitors a carrier having a high priority. In addition, when the carrier 100 and the carrier B have the same priority and the priority of the carrier C is lower than that of the carrier A and the carrier B, the UE 100-2 monitors one of the carrier A and the carrier B, and It is not necessary to monitor.
  • FIG. 51 is a diagram for explaining the operating environment according to the tenth embodiment.
  • the UE 100-1 is located in a cell managed by the eNB 200, and can perform cellular communication (LTE-Uu) with the eNB 200.
  • UE 100-1 is in the RRC connected state.
  • the UE 100-1 is in the RRC idle state.
  • the UE 100-1 may shift from the RRC idle state to the RRC connected state.
  • the UE 100-2 is located outside the cell managed by eNB 200.
  • the UE 100-2 may be a remote UE.
  • the UE 100-1 may be a relay UE that serves a remote UE.
  • UE 100-1 and UE 100-2 are in a state in which direct communication is being executed or in a state before starting execution of direct communication.
  • the UE 100-1 and the UE 100-2 can perform direct communication using the resource pool shown in FIG.
  • FIG. 52 is a sequence diagram for explaining the operation according to the embodiment.
  • FIG. 53 is a diagram for explaining the operation according to the embodiment.
  • the eNB 200 notifies the UE 100-1 of information regarding the priority of identification information regarding the logical channel (for example, logical channel group identifier (LCG ID)).
  • the eNB 200 may notify the UE 100-1 of a priority list indicating the association between the priority and the LCG ID. For example, in the list, priority 0 (for example, Low priority) and LCG ID # 1 are associated with each other, and priority 1 (for example, High priority) and LCG ID # 2 are associated with each other.
  • the identification information regarding the logical channel may be a logical channel identifier (LCID). Therefore, LCID and priority may be associated.
  • LCID logical channel identifier
  • the eNB 200 may notify the UE 100-1 of an LCG ID (or LCID) having a higher priority than a normal LCG ID (or LCID) as information on the priority. For example, in the priority list, an LCG ID (or LCID) with a low priority is not described, and an LCG ID (or LCID) with a high priority may be described. Therefore, the UE 100-1 may determine that an LCG ID (or LCID) not listed in the priority list has a normal priority.
  • the eNB 200 may notify the UE 100-1 of information on priority (hereinafter referred to as priority list) by broadcast (for example, SIB), or notify the UE 100-1 by unicast (for example, RRC reconfiguration message). May be.
  • priority list information on priority
  • unicast for example, RRC reconfiguration message
  • the UE 100-1 grasps the association between the priority and the LCG ID based on the received priority list.
  • the eNB 200 transmits setting information for setting the control resource pool to the UE 100-1 before the UE 100-1 and the UE 100-2 perform direct communication. Thereby, the eNB 200 sets the control resource pool in the UE 100-1. In the UE 100-1, a control resource pool is set based on the setting information. The UE 100-1 directly communicates with the UE 100-2 using the set control resource pool. Specifically, the UE 100-1 autonomously selects a control resource in the set control resource pool in direct communication. Alternatively, the UE 100-1 may be assigned from the eNB 200 the control resource in the set control resource pool.
  • the eNB 200 transmits setting information for setting the data resource pool to the UE 100-1.
  • the eNB 200 sets a data resource pool in the UE 100-1.
  • a data resource pool is set based on the setting information.
  • the UE 100-1 directly communicates with the UE 100-2 using the set data resource pool.
  • the UE 100-1 autonomously selects a data resource from the set control resource pool in direct communication. Since a data resource pool is set for the UE 100-1, no data resource is allocated from the eNB 200 unless data with high priority is generated as will be described later.
  • the UE 100-2 since the UE 100-2 is located outside the coverage of the cell, the UE 100-2 communicates directly with the UE 100-1 using a preset control and data resource pool.
  • the control and data resource pool When the UE 100-2 is located in the cell of the eNB 200 and the control and data resource pool is not set in advance in the UE 100-2 (for example, USIM (Universal Subscriber Identity Module)), the control and data resource pool The control and data resource pools may be set in advance based on the setting information.
  • the UE 100-2 autonomously selects radio resources (control resources and data resources) in a preset control and data resource pool.
  • step S1220 high priority data (hereinafter, high priority data) is generated in the UE 100-1.
  • the UE 100-1 may recognize that high-priority data has occurred when data is generated on a logical channel (or a corresponding bearer) belonging to the LCG having a high priority.
  • the UE 100-1 creates a buffer status report (SL-BSR: Sidelink Buffer Status Report) in the proximity service. The contents of the SL-BSR will be described later (see step S1240).
  • the high priority data may not be data having high priority.
  • the high priority data may be data (Middle priority) having a higher priority than data (for example, Low priority) transmitted by the UE 100-1 using the control resource in the control resource pool.
  • the UE 100-1 transmits the destination list to the eNB 200.
  • the destination list includes a destination identifier (Destination ID) indicating a partner of direct communication.
  • the UE 100-1 can transmit the destination list by a SLUEInformation message.
  • the UE 100-1 may transmit the destination list to the eNB 200 before high priority data is generated. For example, when the destination list is changed, the UE 100-1 may transmit the destination list to the eNB 200 before high priority data is generated. Also, the UE 100-1 may omit step S1230 when the eNB 200 knows the partner of direct communication.
  • step S1240 the UE 100-1 notifies the eNB 200 of the buffer status report (SL-BSR) in the proximity service as information indicating that high priority data has occurred.
  • SL-BSR is a buffer status report for direct communication.
  • the SL-BSR includes information indicating the buffer amount of high priority data.
  • the UE 100-1 transmits the SL-BSR to the eNB 200 in consideration of the priority.
  • the UE 100-1 may transmit the SL-BSR to the eNB 200 with the highest priority when high priority data is generated.
  • the UE 100-1 may transmit SL-BSR related to high priority data with priority over a buffer status report (Cellular BSR (Buffer Status Report)) in cellular communication. Therefore, the UE 100-1 uses the buffer amount (data amount) of normal data transmitted by direct communication instead of the BSR for cellular communication and the high priority data as the SL-BSR including the buffer amount (data amount) of high priority data. May be preferentially transmitted to the eNB 200 over the SL-BSR including In addition, when the high priority data is data for public safety, the UE 100-1 may transmit the highest priority data to the eNB 200.
  • Cellular BSR Buffer Status Report
  • the UE 100-1 includes the destination identifier index, the LCG ID, and the buffer amount associated with the LCG ID in the SL-BSR.
  • the UE 100-1 determines the LCG ID to be included in the SL-BSR based on the priority list received from the eNB 200. Specifically, the UE 100-1 determines an LCG ID having a priority corresponding to the priority of the high priority data as an LCG ID included in the SL-BSR. Further, the UE 100-1 includes the data amount of the high priority data in the SL-BSR as the buffer amount corresponding to the determined LCG ID.
  • the UE 100-1 determines not the LCG ID # 1 associated with the priority 1 but the LCG ID # 2 associated with the priority 2 as the LCG ID included in the SL-BSR.
  • the eNB 200 receives the SL-BSR from the UE 100-1.
  • the eNB 200 allocates radio resources for high priority data based on the destination list and the SL-BSR. Specifically, the eNB 200 causes the UE 100-1 to transmit high priority data to the destination (UE 100-2) corresponding to the index of the destination identifier included in the SL-BSR among the destinations included in the destination list. Allocate radio resources.
  • the eNB 200 determines whether the SL-BSR received from the UE 100-1 is information indicating the occurrence of high priority data based on the LCG ID included in the SL-BSR. Specifically, the eNB 200 determines whether or not the SL-BSR includes an LCG ID having a priority corresponding to the priority of the high priority data. When the eNB 200 includes an LCG ID (LCG ID # 2) with high priority, the eNB 200 determines that the SL-BSR is information indicating the occurrence of high priority data (that is, high priority data has occurred in the UE 100-1). . On the other hand, when the eNB 200 includes a low priority LCG ID (LCG ID # 1), the SL-BSR is not information indicating the occurrence of high priority data (that is, no high priority data is generated in the UE 100-1). Judge.
  • the eNB 200 when the eNB 200 receives the SL-BSR from the UE 100-1 even though the UE 100-1 autonomously selects the radio resources for SCI and data, It may be determined that the information indicates the occurrence of the occurrence.
  • ENB 200 allocates radio resources for high priority data when receiving information (SL-BSR) indicating the generation of high priority data from UE 100-1.
  • the eNB 200 allocates, to the UE 100-1 as a radio resource for the high priority data, a radio resource that is located temporally before the control resource pool that is arranged after the high priority data is generated.
  • the eNB 200 is located outside the data resource pool set in the UE 100-1 and is located in time before the radio resource that can be selected by the UE 100-1 after the high priority data is generated Are assigned to UE 100-1 as radio resources for high priority data.
  • the eNB 200 assigns a control resource for SCI and a data resource for data as radio resources for high priority data.
  • the eNB 200 allocates, to the UE 100-1, radio resources having a frequency different from the radio resource pool (control resource pool and data resource pool) for direct communication in the frequency direction.
  • the eNB 200 may allocate radio resources for cellular communication to the UE 100.
  • the eNB 200 can allocate, to the UE 100, a radio resource that does not interfere with the cellular communication (a radio resource that is not allocated to the cellular UE among the radio resources for the cellular communication) based on the scheduling of the radio resource for the cellular communication. Note that the eNB 200 allocates radio resources not located in the data resource pool to the UE 100-1 so as not to interfere with direct communication performed by other UEs.
  • eNB 200 assigns to UE 100-1 a radio resource located before a radio resource (data resource in PSSCH # 2 in FIG. 53) that UE 100-1 can select after high priority data is generated in the time direction. assign. Specifically, eNB 200 allocates radio resources in SC period # 1 (period of PSSCH # 1) prior to SC period # 2 to UE 100-1. Thereby, the UE 100-1 can transmit high priority data to the UE 100-2 before the SC period # 2 using the radio resource allocated from the eNB 200.
  • the eNB 200 may allocate radio resources in the same arrangement as the side link radio resources. Specifically, the eNB 200 may assign a control resource for PSCCH that is two resource blocks (RB) in the time direction. Moreover, eNB200 may allocate the data resource for PSSCH so that data may be repeatedly transmitted 4 times in the time direction.
  • RB resource blocks
  • the information indicating that the high priority data has been generated is transmitted to the eNB 200.
  • step S1250 the eNB 200 notifies the UE 100-2 of allocation information of radio resources allocated for high priority data.
  • the UE 100-1 receives the radio resource allocation information. As a result, the UE 100-1 is assigned radio resources for high priority data.
  • the eNB 200 can notify the UE 100-1 of radio resource allocation information based on DCI.
  • the eNB 200 uses radio resource allocation information together with flag information (for example, an emergency flag) indicating radio lease allocated for high-priority data, using DCI (DCI format 0) for allocating uplink control information. You may notify UE100-1. Based on the flag information, the UE 100-1 can grasp that the received radio resource allocation information is radio resource allocation information for transmitting high priority data.
  • flag information for example, an emergency flag
  • DCI DCI format 0
  • the UE 100-1 notifies the UE 100-2 of reception request information that triggers an operation (reception operation) for receiving high priority data.
  • the UE 100-1 can notify the reception request information to the UE 100-2.
  • the UE 100-1 notifies the UE 100-2 a predetermined time after receiving the allocation information.
  • the predetermined time may be notified from the eNB 200 to the UE 100-1 together with the radio resource allocation information as timing offset information (Timing offset).
  • the predetermined time may be a predetermined timing (fixed timing).
  • the eNB 200 may notify the allocation information a predetermined time (for example, 4 subframes) before the timing. .
  • the eNB 200 may notify the UE 100-1 of a plurality of radio resources for notifying the reception request information after receiving the radio resource allocation information.
  • the UE 100-1 can notify the reception request information to the UE 100-2 using at least one of a plurality of radio resources. Note that the UE 100-1 may notify the UE 100-2 of the reception request information before receiving the radio resource allocation information.
  • the UE 100-2 uses a physical side link broadcast channel (PSBCH) that carries information related to the system and synchronization, a synchronization signal (Synchronization Signal) in the proximity service, and a proximity service in the proximity service.
  • PSBCH physical side link broadcast channel
  • the reception request information can be notified to the UE 100-2 based on at least one of the discovery signals.
  • the UE 100-1 may include flag information indicating reception request information in the PBSCH, for example.
  • the UE 100-2 performs a reception operation based on flag information (1 bit) included in the PBSCH. For example, when the flag information indicates “0”, the UE 100-2 regards the flag information as reception request information and performs a reception operation. On the other hand, when the flag information indicates “1”, the UE 100-2 does not perform the reception operation.
  • the UE 100-2 may include emergency identification information (SLSS ID) different from the identification information (SLSS ID) included in the normal synchronization signal in the synchronization signal.
  • emergency identification information 336-5111 is provided in addition to normal synchronization signal identification information (0-335).
  • the UE 100-1 transmits a synchronization signal including emergency identification information.
  • the UE 100-2 performs a reception operation when receiving a synchronization signal including emergency identification information.
  • the UE 100-1 may transmit the synchronization signal using an offset different from the offset used in the cell according to an instruction from eNB 200, out of the two offsets related to the transmission time of the synchronization signal.
  • the UE 100-2 performs a reception operation when receiving a synchronization signal using an offset different from the offset used for the synchronization signal received so far.
  • the UE 100-2 performs a reception operation when receiving a synchronization signal using an offset different from the offset instructed from the eNB 200.
  • Discovery offset indicates an offset value from the reference value of the discovery signal transmission period.
  • Communication offset indicates an offset value from the reference value of the SC period. Communication Period indicates the SC period.
  • the UE 100-2 starts a reception operation for receiving high priority data in response to reception of the reception request information.
  • the UE 100-2 performs a reception operation (monitoring) by regarding all predetermined frequency bands (carriers) as PSCCH regions.
  • the predetermined frequency band may be a fixed value set in advance.
  • the reception request information may include information indicating a predetermined frequency band.
  • the UE 100-2 may receive information indicating a predetermined frequency band from the eNB 200 by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message).
  • the UE 100-2 may perform a reception operation until a predetermined time elapses after receiving the reception request information.
  • the UE 100-2 may perform the reception operation from the reception of the reception request information to the reception of stop information for requesting the stop of the reception operation from the UE 100-1.
  • the UE 100-2 may perform a reception operation until it receives a specified number of pieces of information (packets).
  • the UE 100-2 may perform the reception operation until receiving the SCI and / or data from the UE 100-1.
  • the UE 100-2 may receive information on the reception operation (information about which reception operation is executed) from the eNB 200 by broadcast (eg, SIB) or unicast (eg, RRC reconfiguration message). Good.
  • the reception request information may include information regarding the reception operation.
  • the UE 100-2 may execute the reception operation based on preset information (fixed).
  • the UE 100-1 transmits the SCI for notifying the data resource for transmitting the high priority data based on the radio resource allocation information from the eNB 200.
  • the radio resource allocation information from the eNB 200 includes not only a data resource for transmitting high priority data but also a control resource for transmitting SCI.
  • the UE 100-2 grasps data resources used for transmission of high priority data based on the received SCI. When receiving the SCI and / or data, the UE 100-2 ends the reception operation.
  • step S1290 the UE 100-1 transmits high priority data based on the radio resource allocation information from the eNB 200.
  • the UE 100-2 receives the high priority data based on the data resource included in the SCI.
  • the UE 100-1 when the UE 100-1 transmits normal data having a lower priority than the high priority data, the UE 100-1 transmits the high priority data preferentially over the normal data.
  • the UE 100-1 may interrupt the transmission of the normal data at a time when the cut is good and start the transmission of the high priority data. For example, if the retransmission of the packet corresponding to the normal data corresponding to the normal data (repeated transmission four times) is not completed, the UE 100-1 may start the transmission of the high priority data after the retransmission of the packet is completed. Good.
  • the UE 100-1 may immediately stop transmission of normal data and start transmission of high priority data. For example, the UE 100-1 may start transmission of high-priority data even when retransmission of normal data packets is not completed. In this case, the UE 100-1 may notify the UE 100-2 that transmission of normal data has been interrupted. As a result, the UE 100-2 retains the normal data received halfway without discarding it. If the UE 100-2 does not receive from the UE 100-1 that the transmission of normal data has been interrupted, the UE 100-2 may discard the normal data received halfway. When retransmission has not been completed, UE 100-1 may start retransmission after transmission of high priority data is completed. If the UE 100-1 does not notify the UE 100-2 that transmission of normal data has been interrupted, the UE 100-1 may transmit a packet for which retransmission has not been completed as a new packet.
  • the UE 100-1 may notify the UE 100-2 of a timing (Resume Timing) and / or a period (Resume Period) at which transmission of the interrupted normal data is resumed.
  • Resume Timing is information for specifying a PSCCH time resource when resuming transmission of normal data within an SC period in which transmission of normal data is interrupted.
  • Resume Period is information for designating a period in a case where transmission of normal data is resumed after an SC period in which transmission of normal data is interrupted.
  • the UE 100-2 resumes reception of normal data based on Resume Timing and / or Resume Period.
  • the UE 100-1 may determine whether to retransmit the normal data packet before transmitting the high priority data based on the instruction from the eNB 200.
  • the eNB 200 may include interruption flag information (Interrupt flag) in DCI including radio resource allocation information.
  • interruption flag information indicates “True”
  • the UE 100-1 transmits high priority data without completing retransmission of the packet.
  • the interruption flag information indicates “False”
  • the UE 100-1 transmits the high priority data after the retransmission of the packet is completed.
  • DCI may include Resume Timing and / or Resume Period information.
  • UE 100-1 transmits high-priority data while transmitting untransmitted packets using data resources in the data resource pool. Also good.
  • the UE 100-1 when the high priority data occurs, the UE 100-1 can transmit the high priority data within the SC period in which the high priority data has occurred. Thereby, UE100-1 can transmit data appropriately by direct communication. Moreover, since eNB200 allocates the radio
  • the UE 100-1 is a relay UE and the UEs 100-2 to 100-4 are remote UEs.
  • the present invention is not limited to this.
  • the content of each embodiment described above may be applied to a case where UE 100-1 that is not a relay UE transmits data to each of a plurality of UEs 100 (see, for example, FIG. 7).
  • an index may be designated according to the SL grant (DCI) notification timing.
  • DCI SL grant
  • the receiving UE When transmitting a plurality of SCIs with continuous PRBs in the frequency direction, the receiving UE needs to know how many SCIs are transmitted with continuous PRBs. Note that, at present, the reception UE performs reception processing on the assumption that the allocation is performed with 1 PRB.
  • the receiving UE side assumes a plurality of patterns and performs reception processing for the assumed number of patterns.
  • the receiving UE can receive a plurality of SCIs that are continuous in the frequency direction by performing reception processing of the assumed number of patterns.
  • the amount of processing may be enormous, so it is preferable to reduce the number of patterns as much as possible.
  • a method of reducing the number of patterns there is a method of limiting the number of SPR frequency direction continuous PRB allocation and / or limiting the allocation area. For example, the number of consecutive SCI allocations is limited to 1, 2, and 3, and the allocation area is limited as shown in FIG. As shown in FIG. 54, the larger the SCI consecutive allocation number, the smaller the allocation area.
  • the transmitting UE transmits a plurality of SCIs using PRBs that are continuous in the frequency direction so as to satisfy a fixed number (number of continuous PBRs) associated with the resource pool.
  • the receiving UE assumes that a plurality of SCIs corresponding to a fixed number (number of continuous PBRs) associated with the resource pool are sent using PBRs that are continuous in the frequency direction, and performs reception processing. Do.
  • the sending UE may have to put useless information in order to match the number of SCIs to be sent with the fixed number There is sex.
  • a method may be considered in which the transmitting UE sends a new SCI designating another SC-Period. As shown in FIG. 55, by specifying another SC-Period or another resource pool, efficient resource utilization becomes possible.
  • FIG. 56 describes an SCI transmission format for designating another SC-Period.
  • PeriodIndicatorField is a parameter that specifies SC-Period. This SCI is the difference from the sent SC-Period.
  • FIG. 57 describes a new resource pool configuration parameter.
  • numMultipleSCIs is the number of SCIs transmitted in frequency direction continuous PRB.
  • the multi-cluster transmission is a method of assigning PBRs that are consecutive in the frequency direction to one cluster and transmitting a plurality of the clusters at the same timing.
  • the above first to fourth methods may be implemented in combination.
  • the transmitting UE When a plurality of SCIs can be transmitted by continuous PRB in the frequency direction, as shown in FIG. 58, the transmitting UE has a plurality of radio resources for transmitting data to each of a plurality of destinations (Destination 1 to 4). Multiple radio resources for data transmission can be selected to be continuous in the direction.
  • the transmitted data is selected from a plurality of SCIs transmitted with a continuous PRB in the frequency direction.
  • the receiving UE acquires information on a data area allocated to continuous PRBs in the frequency direction from the plurality of received SCIs, and performs reception processing.
  • the receiving UE discards data other than the data addressed to its Destination ID in the data subjected to the receiving process.
  • the UE 100-1 notifies the candidate terminal of the destination identifier of the candidate terminal in advance. For example, when the UE 100-3 recognizes that it is a candidate terminal, even if the UE 100-3 does not include its own destination identifier in the SCI, the UE 100-3 transmits a packet based on the allocation information included in the SCI. You may receive it. For example, when the UE 100-3 is a UE for public safety, the UE 100-3 recognizes itself as a candidate terminal.
  • the UE 100-3 is an important UE (recognizable at the application level), if it has not received a packet for a predetermined time from the UE 100-1, and receives a packet from the UE 100-1 within a predetermined time. In at least one of the cases, the terminal may recognize that it is a candidate terminal. The UE 100-3 may hold a timer for measuring for a predetermined time after the last packet reception.
  • high priority data is generated in the UE 100-1, but the present invention is not limited to this.
  • the above-described operation may be executed when high priority data is generated on the network side.
  • high priority data to be transmitted to the UE 100-2 that is a remote UE occurs on the network side, the above-described operation may be executed.
  • the present invention is not limited to this.
  • the UE 100 and the eNB 200 may perform the same operation as described above.
  • the UE 100-2 may perform monitoring based on the priority associated with the carrier (and the number of reception chains of the UE 100-2).
  • the eNB 200 may determine the third priority information (association between the carrier and the priority) in consideration of the direct discovery carrier. For example, when there is a condition of “cellular communication (DL)> direct communication> direct discovery”, the eNB 200 sets each carrier so that the priority of the carrier for direct discovery does not exceed the priority of the carrier for direct communication. May be given a priority, third priority information may be determined, or a carrier to be set in the UE 100 may be determined.
  • third priority information may be determined, or a carrier to be set in the UE 100 may be determined.
  • the UE 100 and the eNB 200 may perform the same operation as described above in consideration of the priority of the carrier (and / or resource pool) even when any of the following conditions is specified, for example. Good.
  • the UE 100-1 autonomously selects the control resource and the data resource using the set resource pool.
  • Control resources and data resources may be allocated to the UE 100-1 from the resource pool.
  • the eNB 200 allocates, to the UE 100-1, radio resources that are located before the next control resource pool and located outside the resource pool for direct communication, for example. be able to. Even when the eNB 200 allocates control resources (and data resources), if the control resource pool is arranged at intervals in the time direction, there is a possibility that delay of high priority data may occur. is there. Therefore, it is effective for the eNB 200 to allocate to the UE 100-1 a radio resource located before the control resource pool arranged after high priority data is generated.
  • the eNB 200 allocates to the UE 100 radio resources that are located in the data resource pool for direct communication and that are located temporally before the next control resource pool as radio resources for control information and data communication. May be. For example, when the number of UEs that are directly communicating using the data resource pool is small, the eNB 200 is less likely to cause interference, and thus the radio resource located in the data resource pool for direct communication is not used. You may allocate to UE100 as a radio
  • high priority data is generated in the UE 100-1, but the present invention is not limited to this.
  • the above-described operation may be executed when high priority data is generated on the network side.
  • the above-described operation may be executed.
  • the eNB 200 transmits radio resource allocation information for high priority data to the UE 100-1 without receiving information indicating the occurrence of high priority data from the UE 100-1.
  • the UE 100-1 has transmitted the SL-BSR to the eNB 200 as information indicating the occurrence of high priority data, but is not limited thereto.
  • the UE 100-1 may transmit a radio resource allocation request for high priority data to the eNB 200 (for example, a SLUE Information message).
  • the eNB 200 may transmit the radio resource allocation information to the UE 100-1 in response to receiving the radio resource allocation request.
  • the UE 100-1 transmits the SCI for notifying the location of the data resource used for transmitting the high priority data, but is not limited thereto.
  • the UE 100-1 may transmit high priority data without transmitting the SCI.
  • the UE 100-1 may include information corresponding to the SCI for high priority data in the reception request information.
  • the UE 100-1 receives information corresponding to the SCI for high priority data by broadcast (for example, SIB) or unicast (for example, RRC reconfiguration message). Also good.
  • the UE 100-2 can execute an operation for receiving high priority data based on information corresponding to the SCI.
  • the UE 100-2 may execute a reception operation based on preset information (fixed). Alternatively, after receiving the reception request information, the UE 100-2 may monitor all radio resources (including radio resources not located in the data resource pool) to which high priority data can be transmitted. The UE 100-2 may perform monitoring until a predetermined time elapses after receiving the reception request information. The UE 100-2 may perform monitoring after receiving the reception request information until receiving the stop information for requesting the stop of the reception operation from the UE 100-1. Alternatively, the UE 100-2 may perform monitoring until it receives a specified number of pieces of information (packets).
  • packets packets
  • the LTE system has been described as an example of a mobile communication system.
  • the present invention is not limited to the LTE system, and the present invention may be applied to a system other than the LTE system.
  • Latency requirements for UE-to-network relay One use case for UE-to-network relay is the group communication service.
  • the group communication service enabler (GCSE) has the following performance requirements.
  • UE-to-network relay operation should be required to meet GCSE latency requirements.
  • the time from when the UE requests to participate in the pending group communication to the time to receive the group communication should be 300 ms or less.
  • Inter-terminal delay (end to end delay) for media transport for group communication should be 150 ms or less.
  • the GCSE system should support multiple different groups of communications in parallel. Basically, one UE must be able to support one or more different group communication sessions at the same time. All groups should meet GCSE latency requirements.
  • View 1 UE-to-network relay latency should meet the GCSE latency requirement.
  • Latency problem of UE-to-network relay The delay between terminals when using UE-to-network relay was analyzed.
  • the table below shows the inter-terminal delay for media transport when using a unicast bearer for media delivery (Table 1). Periods 1 and 5 are evaluation results of the D2D link latency.
  • UE-to-network link latency assumes minimal unidirectional transmission.
  • a side link grant is received that is a side link grant to be configured that occurs in the first available subframe of the SC period starting at least 4 subframes after the received subframe.
  • a side link grant (ie, DCI format 5) occurs in the same SC period and rewrites a previously set side link grant.
  • the side link grant is selected from the resource pool set (configured) by the higher layer.
  • Proposal 1 Rel-13 should support multiple SCI transmissions within one SC period.
  • Option 1 Multiple SCIs for different destination groups within the SC period (FIG. 61)
  • Option 2 One SCI indicating data resources for each different destination group within the SC period (FIG. 62)
  • Option 3 Multiple TX resource pools for multiple destination groups (FIG. 63) For these options, consider both Mode 1 and Mode 2.
  • Option 1 The eNB indicates one SCI TX resource in DCI format 5.
  • option 1 an enhancement is required to indicate multiple PSCCH and PSSCH resources.
  • Option 1 can use the same SCI format 0 in the current specification, so there is no impact on Rel-12 D2D UE.
  • Option 2 The eNB indicates one SCI TX resource in DCI format 5. When option 2 is applied, enhancements are required to indicate multiple PSCCH and PSSCH resources.
  • the SCI format 0 indicates one L1-destination ID (L1-Destination ID). When option 2 is applied, enhancement to indicate multiple L1-destination IDs is required.
  • the multiplexed group can only have the same L1-transmission destination ID.
  • Option 2 requires a new SCI format / MAC PDU / LCID, so there is no backward compatibility for Rel-12 D2D UE.
  • Option 3 The eNB indicates one SCI TX resource in DCI format 5.
  • enhancement is required to indicate multiple PSCCH and PSSCH resources in each TX resource pool.
  • the eNB When the UE adds a new destination, the eNB should set a new TX resource pool.
  • the received UE power consumption increases.
  • Option 3 may increase delay compared to both Option 1 and Option 2.
  • Option 3 can use the same SCI format 0 in the current specification, so there is no impact on Rel-12 D2D UE.
  • Option 1 The UE randomly selects an SCI TX resource from the resource pool set by the upper layer.
  • the random function should be such that each of the allowed choices can be chosen with equal probability.
  • resource selection needs to be limited to avoid resource collisions in the time domain.
  • TX resource pool is shared by multiple relay UEs, using option 1 may increase resource collisions.
  • Option 1 can use the same SCI format 0 in the current specification, so there is no impact on Rel-12 D2D UE.
  • Option 2 SCI format 0 indicates one L1-destination ID. When option 2 is applied, enhancement to indicate multiple L1-destination IDs is required.
  • the multiplexed group can only have the same L1-transmission destination ID.
  • Option 2 requires a new SCI format / MAC PDU / LCID, so there is no backward compatibility for Rel-12 D2D UE.
  • the received UE power consumption increases.
  • Option 3 may increase delay compared to both Option 1 and Option 2.
  • Option 3 can use the same SCI format 0 in the current specification, so there is no impact on Rel-12 D2D UE.
  • Option 1 is preferable to both Option 2 and Option 3 from the standpoint of standardization impact and backward compatibility.
  • Proposal 2 Rel-13 should support multiple SCIs for different destination groups within one SC period.

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Abstract

Un terminal sans fil selon un mode de réalisation de la présente invention comprend une unité de réception qui reçoit, en provenance d'une station de base, une pluralité d'informations de commande qui comprennent des informations de ressources sans fil utilisées une desserte de proximité et une unité de commande qui, en fonction d'une temporisation de notification de la pluralité d'informations de commande, détermine si chacun des éléments des informations de ressources sans fil incluses dans la pluralité d'informations de commande peuvent être utilisés simultanément ou non.
PCT/JP2016/064398 2015-05-15 2016-05-13 Station de base et terminal sans fil WO2016186059A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16796452.7A EP3297364B1 (fr) 2015-05-15 2016-05-13 Station de base et terminal sans fil
JP2017519199A JP6295377B2 (ja) 2015-05-15 2016-05-13 基地局及び無線端末
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US11337107B2 (en) 2022-05-17
JP6416434B1 (ja) 2018-10-31
EP3297364B1 (fr) 2022-07-06
JP2018110439A (ja) 2018-07-12
EP3297364A1 (fr) 2018-03-21
EP4075901A1 (fr) 2022-10-19
JP6295377B2 (ja) 2018-03-14

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